Entity/Article.php
public function addSource(ArticleSource $source)
    {
        $source->setArticle($this);
        $this->sources[] = $source;

        return $this;
    }
public function addSource(ArticleSource $source)
    {
        $source->setArticle($this);
        $this->sources[] = $source;

        return $this;
    }
Add source

@param ArticleSource $source

@return Article