- Author: Beda Allemann (editor), Erwin Koppen (editor), Dieter Gutzen (editor)
- Language: German
- Year: 1975
- Author: Erwin Koppen (editor), Rüdiger Tiedemann (editor)
- Language: German
- Year: 1983
- Author: Horst Rüdiger (editor), Gerhard Bauer (editor), Erwin Koppen (editor), Manfred Gsteiger (editor)
- Language: German
- Year: 1971
- Author: Horst Rüdiger (editor), Willy R. Berger (editor), Erwin Koppen (editor)
- Language: German
- Year: 1990