Dove, J. C. (1992). Who's who in Germany: A biographical encyclopaedia. Who's who the international red series Verl..

Dove, John C. Who's Who in Germany: A Biographical Encyclopaedia. Essen: Who's who the international red series Verl., 1992.

Dove, John C. Who's Who in Germany: A Biographical Encyclopaedia. Who's who the international red series Verl., 1992.