- Author: Georg Bossong
- Language: German
- Year: 1979
- Author: Andreas Blank
- Language: German
- Year: 1997
- Author: Elisabeth Rudolph
- Language: German
- Year: 1973
- Author: Kurt Baldinger
- Language: German
- Year: 2003
- Author: Jens Lüdtke
- Language: German
- Year: 1978
- Author: Theodor Ebneter
- Language: German
- Year: 1994
- Author: W. Fritz Schmidt
- Language: German
- Year: 1914