{{cite web | url=http://www.europeana.eu/resolve/record/08547/E98C1D179969D3365260B56AC31A18D3C7E3D901|title=Bildnis Albert Methfessel|author=Mayer, Carl (Stahlstecher)|accessdate=2013-05-21 |publisher=Europeana}}

<ref>{{cite web | url=http://www.europeana.eu/resolve/record/08547/E98C1D179969D3365260B56AC31A18D3C7E3D901|title=Bildnis Albert Methfessel|author=Mayer, Carl (Stahlstecher)|accessdate=2013-05-21 |publisher=Europeana}}</ref>