- Author: Stefan Höltgen (editor), Bernd Ulmann (editor), Martin Wendt (editor), Ingo Klöckl (editor)
- Language: German
- Year: 2020
- Author: Stefan Höltgen (editor), Bernd Ulmann (editor), Martin Wendt (editor), Ingo Klöckl (editor)
- Language: German
- Year: 2020
- Author: Stefan Höltgen (editor)
- Language: German
- Year: 2014