- Author: Hermann Spieckermann
- Language: German
- Year: 1989
- Author: Hermann Spieckermann
- Language: German
- Year: 2022
- Author: Reinhard Gregor Kratz, Hermann Spieckermann
- Language: German
- Year: 2000
- Author: Hermann Spieckermann
- Language: German
- Year: 1982
- Author: Hermann Spieckermann
- Language: German
- Year: 2004