- Author: Wolf-Rüdiger Bretzke Karim Barkawi (auth.)
- Language: German
- Year: 2010
- Author: Wolf-Rüdiger Bretzke Karim Barkawi (auth.)
- Language: German
- Year: 2012
- Author: Wolf-Rüdiger Bretzke Karim Barkawi (auth.)
- Language: English
- Year: 2013
- Author: Wolf-Rüdiger Bretzke Karim Barkawi (auth.)
- Language: German
- Year: 2010