diff --git a/application/src/Entity/Node.php b/application/src/Entity/Node.php
index d00066f..9ed99e9 100644
--- a/application/src/Entity/Node.php
+++ b/application/src/Entity/Node.php
@@ -14,6 +14,7 @@ use Doctrine\Common\Collections\Collection;
 
 /**
  * @author kevinfrantz
+ * @todo rename and refactor this class
  * @ORM\Table(name="node")
  * @ORM\Entity()
  */
@@ -39,7 +40,8 @@ class Node extends AbstractEntity implements NodeInterface
     
     /**
      * Many Nodes have many childs.
-     * 
+     * @todo Replace this by self referencing 
+     * @see https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/association-mapping.html
      * @ORM\ManyToMany(targetEntity="Node")
      * @ORM\JoinTable(name="nodes_childs",
      *      joinColumns={@ORM\JoinColumn(name="node_id", referencedColumnName="id")},
diff --git a/application/src/Entity/Source/AbstractSource.php b/application/src/Entity/Source/AbstractSource.php
index e536f6a..364ae1b 100644
--- a/application/src/Entity/Source/AbstractSource.php
+++ b/application/src/Entity/Source/AbstractSource.php
@@ -17,7 +17,7 @@ use App\Entity\Node;
  * @ORM\Table(name="source")
  * @ORM\InheritanceType("JOINED")
  * @ORM\DiscriminatorColumn(name="discr", type="string")
- * @ORM\DiscriminatorMap({"user" = "UserSource","name" = "NameSource"})
+ * @ORM\DiscriminatorMap({"user" = "UserSource","name" = "NameSource","collection" = "SourceCollection"})
  */
 abstract class AbstractSource extends AbstractEntity implements SourceInterface
 {
diff --git a/application/src/Entity/Source/Attribut/SourceMembersAttribut.php b/application/src/Entity/Source/Attribut/SourceMembersAttribut.php
new file mode 100644
index 0000000..075cc19
--- /dev/null
+++ b/application/src/Entity/Source/Attribut/SourceMembersAttribut.php
@@ -0,0 +1,26 @@
+<?php
+namespace App\Entity\Source\Attribut;
+
+use Doctrine\Common\Collections\Collection;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+trait SourceMembersAttribut
+{
+    /**
+     * @var Collection
+     */
+    protected $members;
+    
+    public function getMembers():Collection{
+        return $this->members;
+    }
+    
+    public function setMembers(Collection $members):void{
+        $this->members = $members;
+    }
+}
+
diff --git a/application/src/Entity/Source/Attribut/SourceMembersAttributInterface.php b/application/src/Entity/Source/Attribut/SourceMembersAttributInterface.php
new file mode 100644
index 0000000..0bd7ca6
--- /dev/null
+++ b/application/src/Entity/Source/Attribut/SourceMembersAttributInterface.php
@@ -0,0 +1,29 @@
+<?php
+namespace App\Entity\Source\Attribut;
+
+use Doctrine\Common\Collections\Collection;
+
+/**
+ * Allows to group other sources in a source
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface SourceMembersAttributInterface
+{
+
+    /**
+     * Sets the collection source members
+     *
+     * @param Collection $members
+     */
+    public function setMembers(Collection $members): void;
+
+    /**
+     * Returns the collection source members
+     *
+     * @return Collection
+     */
+    public function getMembers(): Collection;
+}
+
diff --git a/application/src/Entity/Source/SourceCollection.php b/application/src/Entity/Source/SourceCollection.php
new file mode 100644
index 0000000..53a0c0e
--- /dev/null
+++ b/application/src/Entity/Source/SourceCollection.php
@@ -0,0 +1,176 @@
+<?php
+namespace App\Entity\Source;
+
+use App\Entity\Source\Attribut\SourceMembersAttribut;
+use Doctrine\ORM\Mapping as ORM;
+use Doctrine\Common\Collections\Collection;
+use Closure;
+
+/**
+ *
+ * @author kevinfrantz
+ * @ORM\Table(name="source_collection")
+ * @ORM\Entity     
+ */
+class SourceCollection extends AbstractSource implements SourceCollectionInterface
+{
+    use SourceMembersAttribut;
+
+    /**
+     *
+     * @var Collection
+     * @ORM\ManyToMany(targetEntity="AbstractSource")
+     */
+    protected $members;
+    
+    public function next()
+    {
+        return $this->members->next();
+    }
+
+    public function forAll(Closure $p)
+    {
+        return $this->members->forAll($p);
+    }
+
+    public function remove($key)
+    {
+        return $this->members->remove($key);
+    }
+
+    public function current()
+    {
+        return $this->members->current();
+    }
+
+    public function partition(Closure $p)
+    {
+        return $this->members->partition($p);
+    }
+
+    public function offsetExists($offset)
+    {
+        return $this->offsetExists($offset);
+    }
+
+    public function slice($offset, $length = null)
+    {
+        return $this->slice($offset, $length);
+    }
+
+    public function get($key)
+    {
+        return $this->members->get($key);
+    }
+
+    public function offsetUnset($offset)
+    {
+        return $this->members->offsetUnset($offset);
+    }
+
+    public function toArray()
+    {
+        return $this->members->toArray();
+    }
+
+    public function map(Closure $func)
+    {
+        return $this->members->map($func);
+    }
+
+    public function indexOf($element)
+    {
+        return $this->members->indexOf($element);
+    }
+
+    public function key()
+    {
+        return $this->members->key();
+    }
+
+    public function add($element)
+    {
+        return $this->add($element);
+    }
+
+    public function offsetGet($offset)
+    {
+        return $this->members->offsetGet($offset);
+    }
+
+    public function set($key, $value)
+    {
+        return $this->members->set($key, $value);
+    }
+
+    public function getValues()
+    {
+        return $this->members->getValues();
+    }
+
+    public function last()
+    {
+        return $this->members->last();
+    }
+
+    public function containsKey($key)
+    {
+        return $this->members->containsKey($key);
+    }
+
+    public function clear()
+    {
+        return $this->members->clear();
+    }
+
+    public function isEmpty()
+    {
+        return $this->members->isEmpty();
+    }
+
+    public function count()
+    {
+        return $this->members->count();
+    }
+
+    public function getKeys()
+    {
+        return $this->members->getKeys();
+    }
+
+    public function offsetSet($offset, $value)
+    {
+        return $this->members->offsetSet($offset, $value);
+    }
+
+    public function filter(Closure $p)
+    {
+        return $this->members->filter($p);
+    }
+
+    public function contains($element)
+    {
+        return $this->members->contains($element);
+    }
+
+    public function getIterator()
+    {
+        return $this->members->getIterator();
+    }
+
+    public function exists(Closure $p)
+    {
+        return $this->members->exists($p);
+    }
+
+    public function removeElement($element)
+    {
+        return $this->members->removeElement($element);
+    }
+
+    public function first()
+    {
+        return $this->members->first();
+    }
+}
+
diff --git a/application/src/Entity/Source/SourceCollectionInterface.php b/application/src/Entity/Source/SourceCollectionInterface.php
new file mode 100644
index 0000000..d4de89a
--- /dev/null
+++ b/application/src/Entity/Source/SourceCollectionInterface.php
@@ -0,0 +1,107 @@
+<?php
+namespace App\Entity\Source;
+
+use App\Entity\Source\Attribut\SourceMembersAttributInterface;
+use Doctrine\Common\Collections\Collection;
+
+/**
+ * Allows to handle SourceCollections like normal collections.
+ * This interface also specifies the parameters of the collection interface via PHPDoc
+ *
+ * @author kevinfrantz
+ * @todo Map the not jet mapped functions!
+ *      
+ */
+interface SourceCollectionInterface extends SourceMembersAttributInterface, Collection
+{
+
+    /**
+     *
+     * @param SourceInterface $element
+     * @return bool
+     */
+    public function add($element);
+
+    /**
+     *
+     * @param SourceInterface $element
+     * @return bool
+     */
+    public function contains($element);
+
+    /**
+     *
+     * @param SourceInterface $element
+     * @return bool
+     */
+    public function removeElement($element);
+
+    /**
+     *
+     * @param string|int $key
+     * @return SourceInterface|null
+     */
+    public function get($key);
+
+    /**
+     *
+     * @return array|SourceInterface[]
+     */
+    public function getValues();
+
+    /**
+     *
+     * @param string|int $key
+     * @param SourceInterface $value
+     * @return void
+     */
+    public function set($key, $value);
+
+    /**
+     *
+     * @return array|SourceInterface[]
+     */
+    public function toArray();
+
+    /**
+     *
+     * @return SourceInterface
+     */
+    public function first();
+
+    /**
+     *
+     * @return SourceInterface
+     */
+    public function last();
+
+    /**
+     *
+     * @return SourceInterface
+     */
+    public function current();
+
+    /**
+     *
+     * @return SourceInterface
+     */
+    public function next();
+
+    /**
+     *
+     * @param SourceInterface $element
+     *
+     * @return int|string|bool
+     */
+    public function indexOf($element);
+
+    /**
+     *
+     * @param int $offset
+     * @param int|null $length
+     *
+     * @return array|SourceInterface[]
+     */
+    public function slice($offset, $length = null);
+}
+