- Author: Sigusch Volkmar
- Language: German
- Year: 1990
- Author: Sigusch Volkmar
- Language: German
- Year: 2008
- Author: Sigusch Volkmar
- Language: German
- Year: 2016
- Author: Sigusch Volkmar
- Language: German
- Year: 2016
- Author: Sigusch Volkmar
- Language: German
- Year: 2016