- Author: Nußberger Angelika, Schmidt Carmen
- Language: German
- Year: 2005
- Author: Neuner Michael
- Language: German
- Year: 2001
- Author: Merschmann Alexander
- Language: German
- Year: 2019
- Author: Llewellyn Karl N.
- Language: German
- Year: 1977
- Author: Kolbe Jan-Frederik
- Language: German
- Year: 2012
- Author: Klein-Blenkers Friedrich
- Language: German
- Year: 1991
- Author: Jaschinski Herbert
- Language: German
- Year: 1975