- Author: Wolfgang Tschirk
- Language: German
- Year: 2020
- Author: Wolfgang Tschirk
- Language: German
- Year: 2021
- Author: Wolfgang Tschirk
- Language: German
- Year: 2021
- Author: Wolfgang Tschirk
- Language: German
- Year: 2019
- Author: Wolfgang Tschirk (auth.)
- Language: German
- Year: 2014