- Author: Thomas Grüter (auth.)
- Language: German
- Year: 2013
- Author: Thomas Grüter (auth.)
- Language: German
- Year: 2011
- Author: Thomas Grüter
- Language: German
- Year: 2008
- Author: Thomas Grüter
- Language: German
- Year: 2008
- Author: Thomas Grüter
- Language: German
- Year: 2008
- Author: Thomas Grüter
- Language: German
- Year: 2011