- Author: Norbert Köhler, Anton Bigalke, Gabriele Ledworuski, Horst Kuschnerow
- Language: German
- Year: 2018
- Author: Anton Bigalke Horst Kuschnerow Norbert Köhler Gabriele Ledworuski
- Language: German
- Year: 2018
- Author: Tanja Wank Norbert Köhler
- Language: German
- Year: 2011