- Author: Meessen Karl Matthias
- Language: German
- Year: 1966
- Author: Martin Stefanie
- Language: German
- Year: 2006
- Author: Magold Rainer
- Language: German
- Year: 1987
- Author: Liebs Detlef
- Language: German
- Year: 2002
- Author: Lamberts Willi
- Language: German
- Year: 1976
- Author: Lamberty Christiane
- Language: German
- Year: 2000