Von Werra
{{cite web | url=http://www.europeana.eu/resolve/record/08604/43571CD0FDD69BA08F0565852391579BD115043F|title=Von Werra|accessdate=2013-05-19 |publisher=Europeana}}
<ref>{{cite web | url=http://www.europeana.eu/resolve/record/08604/43571CD0FDD69BA08F0565852391579BD115043F|title=Von Werra|accessdate=2013-05-19 |publisher=Europeana}}</ref>