- Author: Ruth Schmidt-Wiegand (editor)
- Language: German
- Year: 1981
- Author: Ludger Kerssen
- Language: German
- Year: 1975
- Author: Christian Thelen
- Language: German
- Year: 1988
- Author: Thomas Frank
- Language: German
- Year: 1991
- Author: Stephanie Coué
- Language: German
- Year: 1996
- Author: Jörgen Vogel
- Language: German
- Year: 1983
- Author: Jan Gerchow
- Language: German
- Year: 1988