- Author: Frank-Michael Barth
- Language: German
- Year: 2016
- Author: Frank-Michael Barth
- Language: German
- Year: 2019
- Author: Frank-Michael Barth
- Language: German
- Year: 2012
- Author: Frank-Michael Barth
- Language: German
- Year: 2014
- Author: Frank-Michael Barth
- Language: English
- Year: 2012