must include references when using retreiver

app.py

@@ -154,15 +154,15 @@ def predict(message, history, request: gr.Request):
             }
         }
     )
-    
+
     source_context = "\nSources:\n" + "\n".join([
-        f"{doc.metadata.get('source_url')} ({doc.metadata.get('date')})\n---"
+        f"{doc.metadata["source"].split("/")[-1]} ({doc.metadata.get('date')})\n---"
         for i, doc in enumerate(relevant_docs)])
     
     print(gpt_response.content )
     print(source_context)
     
-    return gpt_response.content + source_context
+    return gpt_response.content + "\n\n" + source_context
 
 
 # setup tracking