Digitized Gothaisches genealogisches Taschenbuch: Wiki Gotha digitized books
Adlige Familie from A. to Z. http://www.rambow.de/genealogische-nachrichten-einzelner-adliger-familien.html
Buergerlicher Families from A to Z. http://www.rambow.de/ahnenlisten-buergerlicher-familien.html
Bush. M. L. The European Nobility, Vol. 1, Noble Privilege. New York: Holmes and Meyer, 1983.
Bush, M. L. The European Nobiliity, Vol. 2, Rich Noble, Poor Noble. New York: Manchester University Press.