- Author: Karl Graf Ballestrem Volker Gerhardt Henning Ottmann Martyn P. Thompson (eds.)
- Language: German
- Year: 1998
- Author: Volker Gerhardt Renate Reschke (eds.)
- Language: German
- Year: 2006
- Author: Volker Gerhardt
- Language: German
- Year: 2005
- Author: Volker Gerhardt
- Language: German
- Year: 2000
- Author: Volker Gerhardt
- Language: English
- Year: 2010