- Author: Stephan Engelsmann, Valerie Spalding, Stefan Peters
- Language: German
- Year: 2010
- Author: Stephan Engelsmann, Valerie Spalding, Stefan Peters
- Language: English
- Year: 2010
- Author: Stephan Engelsmann, Valerie Spalding, Stefan Peters
- Language: French
- Year: 2012
- Author: Stephan Engelsmann, Valerie Spalding, Stefan Peters
- Language: English
- Year: 2010