- Author: Niederstadt Frank
- Language: German
- Year: 1998
- Author: Merten Detlef
- Language: German
- Year: 1980
- Author: Labe Michael
- Language: German
- Year: 1990
- Author: Kelker Brigitte
- Language: German
- Year: 1993
- Author: Jungemann Lars
- Language: German
- Year: 1999
- Author: Hildt Elisabeth
- Language: German
- Year: 1996
- Author: Heilemann Ullrich, Weihs Claus
- Language: German
- Year: 2007
- Author: Hauenschild Wolf-Dieter
- Language: German
- Year: 1968