- Author: Heike Düselder, Annika Schmitt, Siegrid Westphal
- Language: German
- Year: 2013
- Author: Siegrid Westphal, Hans-Werner Hahn, Geord Schmidt
- Language: German
- Year: 2016
- Author: Christopher Spehr, Siegrid Westphal, Kathrin Paasch
- Language: German
- Year: 2020
- Author: Siegrid Westphal (editor), Stefanie Freyer (editor)
- Language: German
- Year: 2020
- Author: Stephan Wendehorst (editor), Siegrid Westphal (editor)
- Language: German
- Year: 2006
