- Author: Joachim Schiffers, Eckhard Wälzholz, Bert Tillmann
- Language: German
- Year: 2008
- Author: Randolf Mohr, Bert Tillmann
- Language: German
- Year: 2013
- Author: Randolf Mohr, Bert Tillmann
- Language: German
- Year: 2008
- Author: Christoph Rupp, Joachim Schiffers, Eckhard Wälzholz, Gabriel Recnik, Bert Tillmann, Willi Winter
- Language: German
- Year: 2015
- Author: Randolf Mohr, Bert Tillmann
- Language: German
- Year: 2020