diff --git a/application/src/Entity/Source/AbstractSource.php b/application/src/Entity/Source/AbstractSource.php
index 0953f2e..46b7417 100644
--- a/application/src/Entity/Source/AbstractSource.php
+++ b/application/src/Entity/Source/AbstractSource.php
@@ -1,5 +1,4 @@
 <?php
-
 namespace App\Entity\Source;
 
 use Doctrine\ORM\Mapping as ORM;
@@ -20,8 +19,9 @@ use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Validator\Constraints as Assert;
 
 /**
- * @author kevinfrantz
  *
+ * @author kevinfrantz
+ *        
  * @ORM\Entity
  * @ORM\Table(name="source")
  * @ORM\InheritanceType("JOINED")
@@ -57,6 +57,7 @@ abstract class AbstractSource extends AbstractEntity implements SourceInterface
     protected $slug;
 
     /**
+     *
      * @var RelationInterface
      * @ORM\OneToOne(targetEntity="App\Entity\Meta\Relation",cascade={"persist", "remove"})
      * @ORM\JoinColumn(name="relation_id", referencedColumnName="id", onDelete="CASCADE")
@@ -65,15 +66,25 @@ abstract class AbstractSource extends AbstractEntity implements SourceInterface
     protected $relation;
 
     /**
-     * @todo Implement that just one table on database level is needed!
-     * @todo Rename table to use the right schema
+     * Many Sources have many Source Members
+     * @var Collection|SourceInterface[]
+     * @ORM\ManyToMany(targetEntity="AbstractSource", inversedBy="members",cascade={"persist"})
+     * @ORM\JoinTable(name="source_members",
+     *      joinColumns={@ORM\JoinColumn(name="source_id", referencedColumnName="id")},
+     *      inverseJoinColumns={@ORM\JoinColumn(name="member_id", referencedColumnName="id")}
+     *      )
+     */
+    protected $members;
+
+    /**
      *
-     * @var Collection|TreeCollectionSourceInterface[]
-     * @ORM\ManyToMany(targetEntity="App\Entity\Source\Complex\Collection\TreeCollectionSource",mappedBy="collection")
+     * @var Collection|SourceInterface[]
+     * @ORM\ManyToMany(targetEntity="AbstractSource",mappedBy="members",cascade={"persist"})
      */
     protected $memberships;
 
     /**
+     *
      * @ORM\OneToOne(targetEntity="App\Entity\Meta\Law",cascade={"persist", "remove"})
      * @ORM\JoinColumn(name="law_id", referencedColumnName="id")
      *
diff --git a/application/src/Repository/UserSourceRepository.php b/application/src/Repository/UserSourceRepository.php
new file mode 100644
index 0000000..62e88bc
--- /dev/null
+++ b/application/src/Repository/UserSourceRepository.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Repository;
+
+use Doctrine\ORM\EntityRepository;
+
+/**
+ * @author kevinfrantz
+ */
+class UserSourceRepository extends EntityRepository
+{
+}
diff --git a/application/tests/Unit/Repository/UserRepositoryTest.php b/application/tests/Unit/Repository/UserRepositoryTest.php
index d3632d9..03ed805 100644
--- a/application/tests/Unit/Repository/UserRepositoryTest.php
+++ b/application/tests/Unit/Repository/UserRepositoryTest.php
@@ -7,7 +7,7 @@ use Doctrine\ORM\EntityManager;
 use App\Repository\UserRepository;
 use App\Entity\User;
 use App\Entity\UserInterface;
-use App\Entity\Source\Combination\PersonIdentitySourceInterface;
+use App\Entity\Source\Complex\PersonIdentitySourceInterface;
 use App\Entity\Source\Complex\PersonIdentitySource;
 
 class UserRepositoryTest extends KernelTestCase
diff --git a/application/tests/Unit/Repository/UserSourceRepositoryTest.php b/application/tests/Unit/Repository/UserSourceRepositoryTest.php
new file mode 100644
index 0000000..102144e
--- /dev/null
+++ b/application/tests/Unit/Repository/UserSourceRepositoryTest.php
@@ -0,0 +1,103 @@
+<?php
+namespace tests\Unit\Repository;
+
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Doctrine\ORM\EntityManager;
+use App\Entity\UserInterface;
+use App\Repository\UserSourceRepository;
+use App\Entity\Source\Complex\UserSourceInterface;
+use App\Entity\Source\Complex\UserSource;
+
+class UserSourceRepositoryTest extends KernelTestCase
+{
+
+    /**
+     *
+     * @var EntityManager
+     */
+    protected $entityManager;
+
+    /**
+     *
+     * @var UserSourceRepository
+     */
+    protected $userSourceRepository;
+
+    /**
+     *
+     * @var UserSourceInterface
+     */
+    protected $loadedUserSource;
+
+    /**
+     *
+     * @var UserInterface
+     */
+    protected $user;
+
+    /**
+     *
+     * @var UserSourceInterface
+     */
+    protected $userSource;
+
+    public function setUp(): void
+    {
+        $kernel = self::bootKernel();
+        $this->entityManager = $kernel->getContainer()
+            ->get('doctrine')
+            ->getManager();
+        $this->userSourceRepository = $this->entityManager->getRepository(UserSource::class);
+        $this->userSource = new UserSource();
+    }
+
+    public function testMemberships(): void
+    {
+        $userSource2 = new UserSource();
+        $this->userSource->getMemberships()->add($userSource2);
+        $this->entityManager->persist($this->userSource);
+        $this->entityManager->flush();
+        $userSource2Id = $userSource2->getId();
+        $userSourceId = $this->userSource->getId();
+        $this->loadedUserSource = $this->userSourceRepository->find($userSourceId);
+        $this->assertGreaterThan(0, $userSource2Id);
+        $this->assertEquals($userSource2, $this->loadedUserSource->getMemberships()->get(0));
+        $this->deleteUserSource();
+        $this->assertGreaterThan(0, $userSource2Id);
+        $this->entityManager->remove($userSource2);
+        $this->entityManager->flush();
+        $this->assertNull($this->userSourceRepository->find($userSource2Id));
+    }
+
+    public function testCreation(): void
+    {
+        $this->entityManager->persist($this->userSource);
+        $this->entityManager->flush();
+        $userSourceId = $this->userSource->getId();
+        /*
+         * @var UserSourceInterface
+         */
+        $this->loadedUserSource = $this->userSourceRepository->find($userSourceId);
+        $this->assertEquals($userSourceId, $this->loadedUserSource->getId());
+        $this->deleteUserSource();
+    }
+
+    private function deleteUserSource(): void
+    {
+        $this->entityManager->remove($this->loadedUserSource);
+        $this->entityManager->flush();
+    }
+
+    /**
+     *
+     * {@inheritdoc}
+     *
+     * @see \Symfony\Bundle\FrameworkBundle\Test\KernelTestCase::tearDown()
+     */
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+        $this->entityManager->close();
+        $this->entityManager = null;
+    }
+}