diff --git a/resources/functions/citizen/find_citizen_by_id.sql b/resources/functions/citizen/find_citizen_by_id.sql
index 9ca616e..3b8e675 100644
--- a/resources/functions/citizen/find_citizen_by_id.sql
+++ b/resources/functions/citizen/find_citizen_by_id.sql
@@ -1,12 +1,17 @@
-create or replace procedure find_citizen_by_id(in id uuid, inout resource json) language plpgsql as
+create or replace function find_citizen_by_id(in id uuid, out resource json) language plpgsql as
 $$
 declare
     _id alias for id;
 begin
-    select to_json(z) into resource
-    from citizen as z
-    where z.id = _id;
+    select to_json(t) into resource
+    from (
+         select 
+            z.*, 
+            find_user_by_id(z.user_id)
+         from citizen as z
+         where z.id = _id
+     ) as t;
 end;
 $$;
 
--- drop procedure if exists find_citizen_by_id(uuid, inout json);
\ No newline at end of file
+-- drop function if exists find_citizen_by_id(uuid, inout json);
\ No newline at end of file
diff --git a/resources/functions/citizen/find_citizen_by_user_id.sql b/resources/functions/citizen/find_citizen_by_user_id.sql
index 0f9ffe3..3d62d1c 100644
--- a/resources/functions/citizen/find_citizen_by_user_id.sql
+++ b/resources/functions/citizen/find_citizen_by_user_id.sql
@@ -1,12 +1,17 @@
-create or replace procedure find_citizen_by_user_id(in id uuid, inout resource json) language plpgsql as
+create or replace function find_citizen_by_user_id(in user_id uuid, out resource json) language plpgsql as
 $$
 declare
-    _id alias for id;
+    _user_id alias for user_id;
 begin
-    select to_json(z) into resource
-    from citizen as z
-    where z.user_id = _id;
+    select to_json(t) into resource
+    from (
+        select
+            z.*,
+            find_user_by_id(z.user_id)
+        from citizen as z
+        where z.user_id = _user_id
+    ) as t;
 end;
 $$;
 
--- drop procedure if exists find_citizen_by_user_id(uuid, inout json);
\ No newline at end of file
+-- drop function if exists find_citizen_by_user_id(uuid, inout json);
\ No newline at end of file
diff --git a/resources/tests/citizen.sql b/resources/tests/citizen.sql
index 230ae6d..a7be3f4 100644
--- a/resources/tests/citizen.sql
+++ b/resources/tests/citizen.sql
@@ -26,11 +26,11 @@ begin
     end;
 
     -- get citizen by id and check the first name
-    call find_citizen_by_id((created_citizen->>'id')::uuid, selected_citizen);
+    select find_citizen_by_id((created_citizen->>'id')::uuid) into selected_citizen;
     assert selected_citizen#>>'{name, first_name}' = 'George', format('first name must be George, %s', selected_citizen#>>'{name, first_name}');
 
     -- get citizen by user id and check the first name
-    call find_citizen_by_user_id((created_citizen->>'user_id')::uuid, selected_citizen);
+    select find_citizen_by_user_id((created_citizen->>'user_id')::uuid) into selected_citizen;
     assert selected_citizen#>>'{name, first_name}' = 'George', format('first name must be George, %s', selected_citizen#>>'{name, first_name}');
 
     -- delete citizen
@@ -38,7 +38,7 @@ begin
     delete from "user" where username = 'george';
 
     -- check if fint by id return null if citizen not exist
-    call find_citizen_by_user_id((created_citizen->>'user_id')::uuid, selected_citizen);
+    select find_citizen_by_user_id((created_citizen->>'user_id')::uuid) into selected_citizen;
     assert selected_citizen is null, format('citizen must be null if not exist, %s', selected_citizen);
 
     raise notice 'citizen test pass';