- Author: Wernfried Heilen, Sascha Herrwerth
- Language: English
- Year: 2015
- Author: Wernfried Heilen
- Language: English
- Year: 2021
- Author: Wernfried Heilen, Adalbert Braig, Anne Drewer, Patrick Glöckner, Roman Grabbe, Oliver Guerret, Jürgen Kirchner, Thomas Matten, Kirstin Schulz, Heike Semmler
- Language: German
- Year: 2013
- Author: Wernfried Heilen, et al.
- Language: English
- Year: 2014