- Author: Michael Morris
- Language: German
- Year: 2015
- Author: Renato Stiefenhofer
- Language: German
- Year: 2021
- Author: Michael Morris
- Language: German
- Year: 2017
- Author: Gabriele Schuster-Haslinger
- Language: German
- Year: 2019
- Author: Michael Morris
- Language: German
- Year: 2020
- Author: Michael Morris
- Language: German
- Year: 2021