- Author: Wolfgang Büscher, Uwe Gerken, Volker Michael Jänich, Hanns Prütting
- Language: German
- Year: 2013
- Author: Wolfgang Büscher, Uwe Gerken, Volker Michael Jänich, Thomas Winter
- Language: German
- Year: 2021
- Author: Hanns Prütting, Volker Michael Jänich, Hans-Günther Borck
- Language: German
- Year: 2005
- Author: Wolfgang Büscher, Uwe Gerken, Volker Michael Jänich, Thomas Winter
- Language: German
- Year: 2021