- Author: Stefan Smid
- Language: German
- Year: 2011
- Author: Stefan Smid
- Language: German
- Year: 2009
- Author: Stefan Smid, Hans-Peter Rechel
- Language: German
- Year: 2012
- Author: Stefan Smid, Hans-Peter Rechel
- Language: German
- Year: 2016
- Author: Stefan Smid, Hans-Peter Rechel
- Language: German
- Year: 2016