- Author: Stefan Krautschick
- Language: German
- Year: 1983
- Author: Hartwin Brandt
- Language: German
- Year: 1992
- Author: Elke W Merten (editor)
- Language: German
- Year: 1985
- Author: Wolfgang Kosack
- Language: German
- Year: 1971
- Author: Wolfgang Blümel Reinhold Merkelbach Frank Rumscheid
- Language: German
- Year: 2014