- Author: Kai Borgeest (auth.)
- Language: German
- Year: 2010
- Author: Kai Borgeest (auth.)
- Language: German
- Year: 2008
- Author: Kai Borgeest (auth.)
- Language: German
- Year: 2014
- Author: Kai Borgeest (auth.)
- Language: German
- Year: 2010
- Author: Kai Borgeest (auth.)
- Language: German
- Year: 2008