- Author: Paul Koetschau
- Language: German
- Year: 2011
- Author: Paul Koetschau
- Language: German
- Year: 2019
- Author: Paul Koetschau
- Language: German
- Year: 1913
- Author: Paul Koetschau
- Language: German
- Year: 1899
- Author: Paul Koetschau
- Language: German
- Year: 1899