- Author: Michael Franz ( Ed. )
- Language: German
- Year: 2008
- Author: Gert & Niesner Clemens Burkert - Opitz
- Language: German
- Year: 2005
- Author: Jochen Vollert
- Language: English
- Year: 2004
- Author: Jochen Vollert
- Language: English
- Year: 2005
- Author: Soeren Suenkler Marsh Gelbart
- Language: English
- Year: 2006