diff --git a/backend/database/models/agency.py b/backend/database/models/agency.py
index 6b7152f85..7af4f0168 100644
--- a/backend/database/models/agency.py
+++ b/backend/database/models/agency.py
@@ -1,5 +1,6 @@
 from backend.schemas import JsonSerializable, PropertyEnum
 from backend.database.models.types.enums import State
+from backend.database.models.source import Citation
 
 from neomodel import (
     StructuredNode,
@@ -29,6 +30,8 @@ class UnitMembership(StructuredRel, JsonSerializable):
 
 
 class Unit(StructuredNode, JsonSerializable):
+    __hidden_properties__ = ["citations"]
+
     uid = UniqueIdProperty()
     name = StringProperty()
     website_url = StringProperty()
@@ -51,12 +54,16 @@ class Unit(StructuredNode, JsonSerializable):
     officers = RelationshipTo(
         "backend.database.models.officer.Officer",
         "MEMBER_OF", model=UnitMembership)
+    citations = RelationshipTo(
+        'backend.database.models.source.Source', "UPDATED_BY", model=Citation)
 
     def __repr__(self):
         return f"<Unit {self.name}>"
 
 
 class Agency(StructuredNode, JsonSerializable):
+    __hidden_properties__ = ["citations"]
+
     uid = UniqueIdProperty()
     name = StringProperty()
     website_url = StringProperty()
@@ -71,6 +78,8 @@ class Agency(StructuredNode, JsonSerializable):
 
     # Relationships
     units = RelationshipTo("Unit", "ESTABLISHED")
+    citations = RelationshipTo(
+        'backend.database.models.source.Source', "UPDATED_BY", model=Citation)
 
     def __repr__(self):
         return f"<Agency {self.name}>"
diff --git a/backend/database/models/litigation.py b/backend/database/models/litigation.py
index 056620ed6..7a4981bbe 100644
--- a/backend/database/models/litigation.py
+++ b/backend/database/models/litigation.py
@@ -1,4 +1,5 @@
 from backend.schemas import JsonSerializable, PropertyEnum
+from backend.database.models.source import Citation
 from neomodel import (
     StructuredNode,
     StringProperty,
@@ -14,6 +15,8 @@ class LegalCaseType(str, PropertyEnum):
 
 
 class Litigation(StructuredNode, JsonSerializable):
+    __hidden_properties__ = ["citations"]
+
     uid = UniqueIdProperty()
     case_title = StringProperty()
     docket_number = StringProperty()
@@ -31,6 +34,8 @@ class Litigation(StructuredNode, JsonSerializable):
     documents = RelationshipTo("Document", "RELATED_TO")
     dispositions = RelationshipTo("Disposition", "YIELDED")
     defendants = RelationshipTo("Officer", "NAMED_IN")
+    citations = RelationshipTo(
+        'backend.database.models.source.Source', "UPDATED_BY", model=Citation)
 
     def __repr__(self):
         return f"<Litigation {self.uid}:{self.case_title}>"
@@ -43,7 +48,7 @@ class Document(StructuredNode, JsonSerializable):
     url = StringProperty()
 
 
-class Disposition(StructuredNode):
+class Disposition(StructuredNode, JsonSerializable):
     description = StringProperty()
     date = DateProperty()
     disposition = StringProperty()
diff --git a/backend/database/models/officer.py b/backend/database/models/officer.py
index c723b9b2e..6f818b3f8 100644
--- a/backend/database/models/officer.py
+++ b/backend/database/models/officer.py
@@ -1,5 +1,6 @@
 from backend.schemas import JsonSerializable
 from backend.database.models.types.enums import State, Ethnicity, Gender
+from backend.database.models.source import Citation
 
 from neomodel import (
     StructuredNode,
@@ -30,6 +31,7 @@ class Officer(StructuredNode, JsonSerializable):
         "last_name", "suffix", "ethnicity",
         "gender", "date_of_birth"
     ]
+    __hidden_properties__ = ["citations"]
 
     uid = UniqueIdProperty()
     first_name = StringProperty()
@@ -52,6 +54,8 @@ class Officer(StructuredNode, JsonSerializable):
         'backend.database.models.complaint.Investigation', "LEAD_BY")
     commands = Relationship(
         'backend.database.models.agency.Unit', "COMMANDS")
+    citations = RelationshipTo(
+        'backend.database.models.source.Source', "UPDATED_BY", model=Citation)
 
     def __repr__(self):
         return f"<Officer {self.id}>"
diff --git a/backend/database/models/source.py b/backend/database/models/source.py
index 381a26e12..e266b50d9 100644
--- a/backend/database/models/source.py
+++ b/backend/database/models/source.py
@@ -105,6 +105,17 @@ def __repr__(self):
         id={self.uid}>"
 
 
+class Citation(StructuredRel, JsonSerializable):
+    uid = UniqueIdProperty()
+    date = DateTimeProperty(default=datetime.now())
+    url = StringProperty()
+    diff = StringProperty()
+
+    def __repr__(self):
+        """Represent instance as a unique string."""
+        return f"<Citation {self.uid}>"
+
+
 class Source(StructuredNode, JsonSerializable):
     __property_order__ = [
         "uid", "name", "url",