- Author: Karl-Heinz Regnat
- Language: German
- Year: 2002
- Author: Karl Heinz Regnat
- Language: German
- Year: 2005
- Author: Karl H. Regnat
- Language: German
- Year: 2000
- Author: Karl Heinz Regnat
- Language: German
- Year: 1999
- Author: Helmut Erfurth
- Language: German
- Year: 2002
- Author: Fritz Köhl
- Language: German
- Year: 1992
- Author: Fritz Köhl & Axel Niestlé
- Language: German
- Year: 2006
- Author: Fritz Köhl & Axel Niestlé
- Language: German
- Year: 1990
- Author: Eberhard Rössler Hans-Jochen Emsmann
- Language: German
- Year: 1999
- Author: Eberhard Rossler
- Language: German
- Year: 1998