- Author: Siegrid Westphal (editor), Stefanie Freyer (editor)
- Language: German
- Year: 2020
- Author: Stephan Wendehorst (editor), Siegrid Westphal (editor)
- Language: German
- Year: 2006
- Author: Siegrid Westphal (editor), Stefanie Freyer (editor)
- Language: German
- Year: 2020