- Author: Ulrich Bentzien
- Language: German
- Year: 1981
- Author: Hainer Plaul
- Language: German
- Year: 1980
- Author: Hermann Strobach (editor)
- Language: German
- Year: 1976
- Author: Siegfried Neumann
- Language: German
- Year: 1980
- Author: Gisela Griepentrog (editor)
- Language: German
- Year: 1976