
- Author: Dirk Ehlers (editor)
- Language: German
- Year: 2020

- Author: Dirk Ehlers (editor)
- Language: German
- Year: 2009

- Author: Hans-Uwe Erichsen (editor), Dirk Ehlers (editor), Martin Burgi (editor), Dirk Ehlers (editor), et al. (editor)
- Language: German
- Year: 2010

- Author: Dirk Ehlers (editor), Ulrich Becker (editor), Et al. (editor)
- Language: English
- Year: 2007