<https://englishlive.ef.com/de-de/blog/grammatik-und-vokabeln/oxford-comma/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebPage>
<https://englishlive.ef.com/de-de/blog/grammatik-und-vokabeln/oxford-comma/>