diff --git a/frontend/app/trees/[id]/page.tsx b/frontend/app/trees/[id]/page.tsx
index b7907d7..1d54034 100644
--- a/frontend/app/trees/[id]/page.tsx
+++ b/frontend/app/trees/[id]/page.tsx
@@ -56,9 +56,14 @@ export default function TreeDetailPage() {
 
   return (
     <div className="space-y-6">
-      <Link href="/trees" className="text-sm text-[var(--muted)] hover:underline">
-        ← All trees
-      </Link>
+      <div className="flex items-center justify-between">
+        <Link href="/trees" className="text-sm text-[var(--muted)] hover:underline">
+          ← All trees
+        </Link>
+        <Link href={`/trees/${treeId}/sources`} className="text-sm text-bronze hover:underline">
+          Sources →
+        </Link>
+      </div>
 
       <Card>
         <CardHeader>
diff --git a/frontend/app/trees/[id]/persons/[personId]/page.tsx b/frontend/app/trees/[id]/persons/[personId]/page.tsx
index 5a0729e..cf5ac97 100644
--- a/frontend/app/trees/[id]/persons/[personId]/page.tsx
+++ b/frontend/app/trees/[id]/persons/[personId]/page.tsx
@@ -15,10 +15,11 @@ type Event = components["schemas"]["EventRead"];
 type Relationship = components["schemas"]["RelationshipRead"];
 type Qualifier = components["schemas"]["ParentChildQualifier"];
 type RelCreate = components["schemas"]["RelationshipCreate"];
+type Source = components["schemas"]["SourceRead"];
+type Citation = components["schemas"]["CitationRead"];
+type CitationCreate = components["schemas"]["CitationCreate"];
 
-const fieldCls =
-  "h-10 rounded-md border border-[var(--border)] bg-[var(--surface)] px-2 text-sm";
-
+const fieldCls = "h-9 rounded-md border border-[var(--border)] bg-[var(--surface)] px-2 text-sm";
 const QUALIFIERS: Qualifier[] = ["biological", "adoptive", "step", "foster", "donor", "guardian"];
 
 export default function PersonDetailPage() {
@@ -31,6 +32,8 @@ export default function PersonDetailPage() {
   const [people, setPeople] = useState<Person[]>([]);
   const [events, setEvents] = useState<Event[]>([]);
   const [rels, setRels] = useState<Relationship[]>([]);
+  const [sources, setSources] = useState<Source[]>([]);
+  const [citations, setCitations] = useState<Citation[]>([]);
   const [ready, setReady] = useState(false);
 
   const [evType, setEvType] = useState("birth");
@@ -40,6 +43,11 @@ export default function PersonDetailPage() {
   const [relOther, setRelOther] = useState("");
   const [relQual, setRelQual] = useState<Qualifier>("biological");
 
+  // Inline citation form: which fact is being cited ("p" = person, `e:<id>`).
+  const [citeFor, setCiteFor] = useState<string | null>(null);
+  const [citeSource, setCiteSource] = useState("");
+  const [citePage, setCitePage] = useState("");
+
   const load = useCallback(async () => {
     const p = await api.GET("/api/v1/trees/{tree_id}/persons/{person_id}", {
       params: { path: { tree_id: treeId, person_id: personId } },
@@ -49,7 +57,7 @@ export default function PersonDetailPage() {
       return;
     }
     setPerson(p.data ?? null);
-    const [all, ev, rl] = await Promise.all([
+    const [all, ev, rl, src, cit] = await Promise.all([
       api.GET("/api/v1/trees/{tree_id}/persons", { params: { path: { tree_id: treeId } } }),
       api.GET("/api/v1/trees/{tree_id}/persons/{person_id}/events", {
         params: { path: { tree_id: treeId, person_id: personId } },
@@ -57,10 +65,14 @@ export default function PersonDetailPage() {
       api.GET("/api/v1/trees/{tree_id}/persons/{person_id}/relationships", {
         params: { path: { tree_id: treeId, person_id: personId } },
       }),
+      api.GET("/api/v1/trees/{tree_id}/sources", { params: { path: { tree_id: treeId } } }),
+      api.GET("/api/v1/trees/{tree_id}/citations", { params: { path: { tree_id: treeId } } }),
     ]);
     setPeople(all.data ?? []);
     setEvents(ev.data ?? []);
     setRels(rl.data ?? []);
+    setSources(src.data ?? []);
+    setCitations(cit.data ?? []);
     setReady(true);
   }, [router, treeId, personId]);
 
@@ -72,12 +84,18 @@ export default function PersonDetailPage() {
     const m = new Map(people.map((p) => [p.id, p.primary_name ?? "Unnamed"]));
     return (id: string) => m.get(id) ?? "Unknown";
   }, [people]);
+  const sourceName = useMemo(() => {
+    const m = new Map(sources.map((s) => [s.id, s.title]));
+    return (id: string) => m.get(id) ?? "source";
+  }, [sources]);
 
   const others = people.filter((p) => p.id !== personId);
   const parents = rels.filter((r) => r.type === "parent_child" && r.person_to_id === personId);
   const children = rels.filter((r) => r.type === "parent_child" && r.person_from_id === personId);
   const partners = rels.filter((r) => r.type === "partnership");
   const siblings = rels.filter((r) => r.type === "sibling");
+  const eventCites = (id: string) => citations.filter((c) => c.event_id === id);
+  const personCites = citations.filter((c) => c.person_id === personId);
 
   async function addEvent(e: React.FormEvent) {
     e.preventDefault();
@@ -91,7 +109,6 @@ export default function PersonDetailPage() {
       load();
     }
   }
-
   async function removeEvent(id: string) {
     await api.DELETE("/api/v1/trees/{tree_id}/events/{event_id}", {
       params: { path: { tree_id: treeId, event_id: id } },
@@ -121,7 +138,6 @@ export default function PersonDetailPage() {
       load();
     }
   }
-
   async function removeRel(id: string) {
     await api.DELETE("/api/v1/trees/{tree_id}/relationships/{relationship_id}", {
       params: { path: { tree_id: treeId, relationship_id: id } },
@@ -129,9 +145,100 @@ export default function PersonDetailPage() {
     load();
   }
 
+  async function addCitation(target: Partial<CitationCreate>) {
+    if (!citeSource) return;
+    const body: CitationCreate = { source_id: citeSource, page: citePage || null, ...target };
+    const { error } = await api.POST("/api/v1/trees/{tree_id}/citations", {
+      params: { path: { tree_id: treeId } },
+      body,
+    });
+    if (!error) {
+      setCiteFor(null);
+      setCiteSource("");
+      setCitePage("");
+      load();
+    }
+  }
+  async function removeCitation(id: string) {
+    await api.DELETE("/api/v1/trees/{tree_id}/citations/{citation_id}", {
+      params: { path: { tree_id: treeId, citation_id: id } },
+    });
+    load();
+  }
+
   if (!ready) return <p className="text-[var(--muted)]">Loading…</p>;
   if (!person) return <p className="text-[var(--muted)]">Not found.</p>;
 
+  // Inline "cite" control: a badge with count, a toggle, and the picker form.
+  function citeControl(key: string, target: Partial<CitationCreate>, cites: Citation[]) {
+    return (
+      <span className="inline-flex items-center gap-2">
+        {cites.length > 0 && (
+          <span
+            className="rounded bg-bronze/15 px-1.5 py-0.5 text-xs text-bronze"
+            title={cites.map((c) => sourceName(c.source_id)).join(", ")}
+          >
+            ✓ {cites.length} sourced
+          </span>
+        )}
+        {citeFor === key ? (
+          <form
+            onSubmit={(e) => {
+              e.preventDefault();
+              addCitation(target);
+            }}
+            className="inline-flex items-center gap-1"
+          >
+            <select
+              className={fieldCls}
+              value={citeSource}
+              onChange={(e) => setCiteSource(e.target.value)}
+            >
+              <option value="">— source —</option>
+              {sources.map((s) => (
+                <option key={s.id} value={s.id}>
+                  {s.title}
+                </option>
+              ))}
+            </select>
+            <input
+              className={`${fieldCls} w-24`}
+              placeholder="page"
+              value={citePage}
+              onChange={(e) => setCitePage(e.target.value)}
+            />
+            <Button type="submit" size="sm">
+              cite
+            </Button>
+            <button
+              type="button"
+              onClick={() => setCiteFor(null)}
+              className="text-xs text-[var(--muted)]"
+            >
+              cancel
+            </button>
+          </form>
+        ) : sources.length === 0 ? (
+          <Link href={`/trees/${treeId}/sources`} className="text-xs text-[var(--muted)] hover:underline">
+            + add a source first
+          </Link>
+        ) : (
+          <button
+            type="button"
+            onClick={() => {
+              setCiteFor(key);
+              setCiteSource("");
+              setCitePage("");
+            }}
+            className="text-xs text-bronze hover:underline"
+          >
+            + cite
+          </button>
+        )}
+      </span>
+    );
+  }
+
   const relGroup = (label: string, items: Relationship[], otherId: (r: Relationship) => string) =>
     items.length > 0 && (
       <div>
@@ -162,7 +269,10 @@ export default function PersonDetailPage() {
         ← Back to tree
       </Link>
 
-      <h1 className="text-3xl font-semibold">{person.primary_name ?? "Unnamed person"}</h1>
+      <div className="flex flex-wrap items-center justify-between gap-2">
+        <h1 className="text-3xl font-semibold">{person.primary_name ?? "Unnamed person"}</h1>
+        {citeControl("p", { person_id: personId }, personCites)}
+      </div>
 
       <Card>
         <CardHeader>
@@ -172,39 +282,32 @@ export default function PersonDetailPage() {
           {events.length === 0 ? (
             <p className="text-sm text-[var(--muted)]">No events yet.</p>
           ) : (
-            <ul className="space-y-1">
+            <ul className="space-y-2">
               {events.map((ev) => (
-                <li key={ev.id} className="flex items-center justify-between text-sm">
+                <li key={ev.id} className="flex flex-wrap items-center justify-between gap-2 text-sm">
                   <span>
                     <span className="font-medium capitalize">{ev.event_type}</span>
                     {ev.date_value ? (
                       <span className="text-[var(--muted)]"> — {ev.date_value}</span>
                     ) : null}
                   </span>
-                  <button
-                    onClick={() => removeEvent(ev.id)}
-                    className="text-[var(--muted)] hover:text-bronze"
-                    aria-label="Remove"
-                  >
-                    ×
-                  </button>
+                  <span className="flex items-center gap-3">
+                    {citeControl(`e:${ev.id}`, { event_id: ev.id }, eventCites(ev.id))}
+                    <button
+                      onClick={() => removeEvent(ev.id)}
+                      className="text-[var(--muted)] hover:text-bronze"
+                      aria-label="Remove"
+                    >
+                      ×
+                    </button>
+                  </span>
                 </li>
               ))}
             </ul>
           )}
           <form onSubmit={addEvent} className="flex flex-wrap gap-2">
-            <Input
-              className="w-36"
-              placeholder="Event type"
-              value={evType}
-              onChange={(e) => setEvType(e.target.value)}
-            />
-            <Input
-              className="w-40"
-              placeholder="Date (e.g. ABT 1850)"
-              value={evDate}
-              onChange={(e) => setEvDate(e.target.value)}
-            />
+            <Input className="w-36" placeholder="Event type" value={evType} onChange={(e) => setEvType(e.target.value)} />
+            <Input className="w-40" placeholder="Date (e.g. ABT 1850)" value={evDate} onChange={(e) => setEvDate(e.target.value)} />
             <Button type="submit">Add event</Button>
           </form>
         </CardContent>
@@ -235,21 +338,13 @@ export default function PersonDetailPage() {
           ) : (
             <form onSubmit={addRel} className="flex flex-wrap items-center gap-2">
               <span className="text-sm text-[var(--muted)]">Add</span>
-              <select
-                className={fieldCls}
-                value={relKind}
-                onChange={(e) => setRelKind(e.target.value as typeof relKind)}
-              >
+              <select className={fieldCls} value={relKind} onChange={(e) => setRelKind(e.target.value as typeof relKind)}>
                 <option value="parent">parent</option>
                 <option value="child">child</option>
                 <option value="partner">partner</option>
                 <option value="sibling">sibling</option>
               </select>
-              <select
-                className={fieldCls}
-                value={relOther}
-                onChange={(e) => setRelOther(e.target.value)}
-              >
+              <select className={fieldCls} value={relOther} onChange={(e) => setRelOther(e.target.value)}>
                 <option value="">— person —</option>
                 {others.map((p) => (
                   <option key={p.id} value={p.id}>
@@ -258,11 +353,7 @@ export default function PersonDetailPage() {
                 ))}
               </select>
               {(relKind === "parent" || relKind === "child") && (
-                <select
-                  className={fieldCls}
-                  value={relQual}
-                  onChange={(e) => setRelQual(e.target.value as Qualifier)}
-                >
+                <select className={fieldCls} value={relQual} onChange={(e) => setRelQual(e.target.value as Qualifier)}>
                   {QUALIFIERS.map((q) => (
                     <option key={q} value={q}>
                       {q}
diff --git a/frontend/app/trees/[id]/sources/page.tsx b/frontend/app/trees/[id]/sources/page.tsx
new file mode 100644
index 0000000..b1aabc2
--- /dev/null
+++ b/frontend/app/trees/[id]/sources/page.tsx
@@ -0,0 +1,131 @@
+"use client";
+
+import Link from "next/link";
+import { useParams, useRouter } from "next/navigation";
+import { useCallback, useEffect, useState } from "react";
+
+import { api } from "@/lib/api/client";
+import type { components } from "@/lib/api/schema";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { Input } from "@/components/ui/input";
+
+type Source = components["schemas"]["SourceRead"];
+
+export default function SourcesPage() {
+  const router = useRouter();
+  const params = useParams<{ id: string }>();
+  const treeId = params.id;
+
+  const [sources, setSources] = useState<Source[]>([]);
+  const [ready, setReady] = useState(false);
+  const [title, setTitle] = useState("");
+  const [repository, setRepository] = useState("");
+  const [url, setUrl] = useState("");
+
+  const load = useCallback(async () => {
+    const { data, response } = await api.GET("/api/v1/trees/{tree_id}/sources", {
+      params: { path: { tree_id: treeId } },
+    });
+    if (response.status === 401) {
+      router.push("/login");
+      return;
+    }
+    setSources(data ?? []);
+    setReady(true);
+  }, [router, treeId]);
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  async function add(e: React.FormEvent) {
+    e.preventDefault();
+    if (!title.trim()) return;
+    const { error } = await api.POST("/api/v1/trees/{tree_id}/sources", {
+      params: { path: { tree_id: treeId } },
+      body: { title, repository: repository || null, url: url || null },
+    });
+    if (!error) {
+      setTitle("");
+      setRepository("");
+      setUrl("");
+      load();
+    }
+  }
+
+  async function remove(id: string) {
+    await api.DELETE("/api/v1/trees/{tree_id}/sources/{source_id}", {
+      params: { path: { tree_id: treeId, source_id: id } },
+    });
+    load();
+  }
+
+  if (!ready) return <p className="text-[var(--muted)]">Loading…</p>;
+
+  return (
+    <div className="space-y-6">
+      <Link href={`/trees/${treeId}`} className="text-sm text-[var(--muted)] hover:underline">
+        ← Back to tree
+      </Link>
+      <h1 className="text-2xl font-bold">Sources</h1>
+
+      <Card>
+        <CardHeader>
+          <CardTitle className="text-base">New source</CardTitle>
+        </CardHeader>
+        <CardContent>
+          <form onSubmit={add} className="flex flex-wrap gap-2">
+            <Input
+              className="w-56"
+              placeholder="Title (e.g. 1880 US Census)"
+              value={title}
+              onChange={(e) => setTitle(e.target.value)}
+            />
+            <Input
+              className="w-40"
+              placeholder="Repository"
+              value={repository}
+              onChange={(e) => setRepository(e.target.value)}
+            />
+            <Input
+              className="w-48"
+              placeholder="URL"
+              value={url}
+              onChange={(e) => setUrl(e.target.value)}
+            />
+            <Button type="submit">Add source</Button>
+          </form>
+        </CardContent>
+      </Card>
+
+      {sources.length === 0 ? (
+        <p className="text-[var(--muted)]">No sources yet — add one above, then cite it on facts.</p>
+      ) : (
+        <ul className="space-y-2">
+          {sources.map((s) => (
+            <li key={s.id}>
+              <Card>
+                <CardContent className="flex items-start justify-between gap-3 p-4">
+                  <div>
+                    <div className="font-medium">{s.title}</div>
+                    <div className="text-sm text-[var(--muted)]">
+                      {[s.repository, s.url].filter(Boolean).join(" · ")}
+                    </div>
+                  </div>
+                  <button
+                    onClick={() => remove(s.id)}
+                    className="text-[var(--muted)] hover:text-bronze"
+                    aria-label="Remove"
+                  >
+                    ×
+                  </button>
+                </CardContent>
+              </Card>
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}
diff --git a/frontend/lib/api/schema.d.ts b/frontend/lib/api/schema.d.ts
index ac8b28c..0234c29 100644
--- a/frontend/lib/api/schema.d.ts
+++ b/frontend/lib/api/schema.d.ts
@@ -329,10 +329,143 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/api/v1/trees/{tree_id}/sources": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /** List Sources */
+        get: operations["list_sources_api_v1_trees__tree_id__sources_get"];
+        put?: never;
+        /** Create Source */
+        post: operations["create_source_api_v1_trees__tree_id__sources_post"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/api/v1/trees/{tree_id}/sources/{source_id}": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /** Get Source */
+        get: operations["get_source_api_v1_trees__tree_id__sources__source_id__get"];
+        put?: never;
+        post?: never;
+        /** Delete Source */
+        delete: operations["delete_source_api_v1_trees__tree_id__sources__source_id__delete"];
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/api/v1/trees/{tree_id}/citations": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /** List Citations */
+        get: operations["list_citations_api_v1_trees__tree_id__citations_get"];
+        put?: never;
+        /** Create Citation */
+        post: operations["create_citation_api_v1_trees__tree_id__citations_post"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+    "/api/v1/trees/{tree_id}/citations/{citation_id}": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        post?: never;
+        /** Delete Citation */
+        delete: operations["delete_citation_api_v1_trees__tree_id__citations__citation_id__delete"];
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
 }
 export type webhooks = Record<string, never>;
 export interface components {
     schemas: {
+        /**
+         * CitationConfidence
+         * @enum {string}
+         */
+        CitationConfidence: "high" | "medium" | "low";
+        /** CitationCreate */
+        CitationCreate: {
+            /**
+             * Source Id
+             * Format: uuid
+             */
+            source_id: string;
+            /** Person Id */
+            person_id?: string | null;
+            /** Event Id */
+            event_id?: string | null;
+            /** Name Id */
+            name_id?: string | null;
+            /** Relationship Id */
+            relationship_id?: string | null;
+            /** Page */
+            page?: string | null;
+            /** Detail */
+            detail?: string | null;
+            confidence?: components["schemas"]["CitationConfidence"] | null;
+        };
+        /** CitationRead */
+        CitationRead: {
+            /**
+             * Id
+             * Format: uuid
+             */
+            id: string;
+            /**
+             * Tree Id
+             * Format: uuid
+             */
+            tree_id: string;
+            /**
+             * Source Id
+             * Format: uuid
+             */
+            source_id: string;
+            /** Person Id */
+            person_id: string | null;
+            /** Event Id */
+            event_id: string | null;
+            /** Name Id */
+            name_id: string | null;
+            /** Relationship Id */
+            relationship_id: string | null;
+            /** Page */
+            page: string | null;
+            /** Detail */
+            detail: string | null;
+            confidence: components["schemas"]["CitationConfidence"] | null;
+            /**
+             * Created At
+             * Format: date-time
+             */
+            created_at: string;
+        };
         /** EventCreate */
         EventCreate: {
             /** Event Type */
@@ -552,6 +685,59 @@ export interface components {
              */
             expires_at: string;
         };
+        /** SourceCreate */
+        SourceCreate: {
+            /** Title */
+            title: string;
+            /** Author */
+            author?: string | null;
+            /** Source Type */
+            source_type?: string | null;
+            /** Repository */
+            repository?: string | null;
+            /** Url */
+            url?: string | null;
+            /** Citation Text */
+            citation_text?: string | null;
+            /** Publication Info */
+            publication_info?: string | null;
+            /** Quality Note */
+            quality_note?: string | null;
+        };
+        /** SourceRead */
+        SourceRead: {
+            /**
+             * Id
+             * Format: uuid
+             */
+            id: string;
+            /**
+             * Tree Id
+             * Format: uuid
+             */
+            tree_id: string;
+            /** Title */
+            title: string;
+            /** Author */
+            author: string | null;
+            /** Source Type */
+            source_type: string | null;
+            /** Repository */
+            repository: string | null;
+            /** Url */
+            url: string | null;
+            /** Citation Text */
+            citation_text: string | null;
+            /** Publication Info */
+            publication_info: string | null;
+            /** Quality Note */
+            quality_note: string | null;
+            /**
+             * Created At
+             * Format: date-time
+             */
+            created_at: string;
+        };
         /** TokenRequest */
         TokenRequest: {
             /** Token */
@@ -1256,4 +1442,228 @@ export interface operations {
             };
         };
     };
+    list_sources_api_v1_trees__tree_id__sources_get: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["SourceRead"][];
+                };
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    create_source_api_v1_trees__tree_id__sources_post: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": components["schemas"]["SourceCreate"];
+            };
+        };
+        responses: {
+            /** @description Successful Response */
+            201: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["SourceRead"];
+                };
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    get_source_api_v1_trees__tree_id__sources__source_id__get: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+                source_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["SourceRead"];
+                };
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    delete_source_api_v1_trees__tree_id__sources__source_id__delete: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+                source_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            204: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    list_citations_api_v1_trees__tree_id__citations_get: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["CitationRead"][];
+                };
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    create_citation_api_v1_trees__tree_id__citations_post: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": components["schemas"]["CitationCreate"];
+            };
+        };
+        responses: {
+            /** @description Successful Response */
+            201: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["CitationRead"];
+                };
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
+    delete_citation_api_v1_trees__tree_id__citations__citation_id__delete: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                tree_id: string;
+                citation_id: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            204: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
+            /** @description Validation Error */
+            422: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["HTTPValidationError"];
+                };
+            };
+        };
+    };
 }
diff --git a/frontend/openapi.json b/frontend/openapi.json
index cdd5477..76534b9 100644
--- a/frontend/openapi.json
+++ b/frontend/openapi.json
@@ -849,10 +849,571 @@
           }
         }
       }
+    },
+    "/api/v1/trees/{tree_id}/sources": {
+      "post": {
+        "tags": [
+          "sources"
+        ],
+        "summary": "Create Source",
+        "operationId": "create_source_api_v1_trees__tree_id__sources_post",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          }
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/SourceCreate"
+              }
+            }
+          }
+        },
+        "responses": {
+          "201": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/SourceRead"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      },
+      "get": {
+        "tags": [
+          "sources"
+        ],
+        "summary": "List Sources",
+        "operationId": "list_sources_api_v1_trees__tree_id__sources_get",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/SourceRead"
+                  },
+                  "title": "Response List Sources Api V1 Trees  Tree Id  Sources Get"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/api/v1/trees/{tree_id}/sources/{source_id}": {
+      "get": {
+        "tags": [
+          "sources"
+        ],
+        "summary": "Get Source",
+        "operationId": "get_source_api_v1_trees__tree_id__sources__source_id__get",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          },
+          {
+            "name": "source_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Source Id"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/SourceRead"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      },
+      "delete": {
+        "tags": [
+          "sources"
+        ],
+        "summary": "Delete Source",
+        "operationId": "delete_source_api_v1_trees__tree_id__sources__source_id__delete",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          },
+          {
+            "name": "source_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Source Id"
+            }
+          }
+        ],
+        "responses": {
+          "204": {
+            "description": "Successful Response"
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/api/v1/trees/{tree_id}/citations": {
+      "post": {
+        "tags": [
+          "citations"
+        ],
+        "summary": "Create Citation",
+        "operationId": "create_citation_api_v1_trees__tree_id__citations_post",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          }
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/CitationCreate"
+              }
+            }
+          }
+        },
+        "responses": {
+          "201": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/CitationRead"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      },
+      "get": {
+        "tags": [
+          "citations"
+        ],
+        "summary": "List Citations",
+        "operationId": "list_citations_api_v1_trees__tree_id__citations_get",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/CitationRead"
+                  },
+                  "title": "Response List Citations Api V1 Trees  Tree Id  Citations Get"
+                }
+              }
+            }
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/api/v1/trees/{tree_id}/citations/{citation_id}": {
+      "delete": {
+        "tags": [
+          "citations"
+        ],
+        "summary": "Delete Citation",
+        "operationId": "delete_citation_api_v1_trees__tree_id__citations__citation_id__delete",
+        "parameters": [
+          {
+            "name": "tree_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Tree Id"
+            }
+          },
+          {
+            "name": "citation_id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "uuid",
+              "title": "Citation Id"
+            }
+          }
+        ],
+        "responses": {
+          "204": {
+            "description": "Successful Response"
+          },
+          "422": {
+            "description": "Validation Error",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/HTTPValidationError"
+                }
+              }
+            }
+          }
+        }
+      }
     }
   },
   "components": {
     "schemas": {
+      "CitationConfidence": {
+        "type": "string",
+        "enum": [
+          "high",
+          "medium",
+          "low"
+        ],
+        "title": "CitationConfidence"
+      },
+      "CitationCreate": {
+        "properties": {
+          "source_id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Source Id"
+          },
+          "person_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Person Id"
+          },
+          "event_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Event Id"
+          },
+          "name_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Name Id"
+          },
+          "relationship_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Relationship Id"
+          },
+          "page": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Page"
+          },
+          "detail": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Detail"
+          },
+          "confidence": {
+            "anyOf": [
+              {
+                "$ref": "#/components/schemas/CitationConfidence"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object",
+        "required": [
+          "source_id"
+        ],
+        "title": "CitationCreate"
+      },
+      "CitationRead": {
+        "properties": {
+          "id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Id"
+          },
+          "tree_id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Tree Id"
+          },
+          "source_id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Source Id"
+          },
+          "person_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Person Id"
+          },
+          "event_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Event Id"
+          },
+          "name_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Name Id"
+          },
+          "relationship_id": {
+            "anyOf": [
+              {
+                "type": "string",
+                "format": "uuid"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Relationship Id"
+          },
+          "page": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Page"
+          },
+          "detail": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Detail"
+          },
+          "confidence": {
+            "anyOf": [
+              {
+                "$ref": "#/components/schemas/CitationConfidence"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "created_at": {
+            "type": "string",
+            "format": "date-time",
+            "title": "Created At"
+          }
+        },
+        "type": "object",
+        "required": [
+          "id",
+          "tree_id",
+          "source_id",
+          "person_id",
+          "event_id",
+          "name_id",
+          "relationship_id",
+          "page",
+          "detail",
+          "confidence",
+          "created_at"
+        ],
+        "title": "CitationRead"
+      },
       "EventCreate": {
         "properties": {
           "event_type": {
@@ -1512,6 +2073,211 @@
         ],
         "title": "SessionRead"
       },
+      "SourceCreate": {
+        "properties": {
+          "title": {
+            "type": "string",
+            "title": "Title"
+          },
+          "author": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Author"
+          },
+          "source_type": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Source Type"
+          },
+          "repository": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Repository"
+          },
+          "url": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Url"
+          },
+          "citation_text": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Citation Text"
+          },
+          "publication_info": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Publication Info"
+          },
+          "quality_note": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Quality Note"
+          }
+        },
+        "type": "object",
+        "required": [
+          "title"
+        ],
+        "title": "SourceCreate"
+      },
+      "SourceRead": {
+        "properties": {
+          "id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Id"
+          },
+          "tree_id": {
+            "type": "string",
+            "format": "uuid",
+            "title": "Tree Id"
+          },
+          "title": {
+            "type": "string",
+            "title": "Title"
+          },
+          "author": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Author"
+          },
+          "source_type": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Source Type"
+          },
+          "repository": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Repository"
+          },
+          "url": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Url"
+          },
+          "citation_text": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Citation Text"
+          },
+          "publication_info": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Publication Info"
+          },
+          "quality_note": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "title": "Quality Note"
+          },
+          "created_at": {
+            "type": "string",
+            "format": "date-time",
+            "title": "Created At"
+          }
+        },
+        "type": "object",
+        "required": [
+          "id",
+          "tree_id",
+          "title",
+          "author",
+          "source_type",
+          "repository",
+          "url",
+          "citation_text",
+          "publication_info",
+          "quality_note",
+          "created_at"
+        ],
+        "title": "SourceRead"
+      },
       "TokenRequest": {
         "properties": {
           "token": {