- Author: Hans-Edwin Friedrich, Barbara Potthast
- Language: German
- Year: 2015
- Author: Michael Ansel (editor), Hans Edwin Friedrich (editor), Gerhard Lauer (editor)
- Language: German
- Year: 2009
- Author: Hans-Edwin Friedrich
- Language: German
- Year: 1995
- Author: Hans-Edwin Friedrich
- Language: German
- Year: 2000
- Author: Hans Edwin Friedrich (editor), Fotis Jannidis (editor), Marianne Willems (editor)
- Language: German
- Year: 2006
- Author: Hans Edwin Friedrich (editor) Fotis Jannidis (editor) Marianne Willems (editor)
- Language: German
- Year: 2006
- Author: Hans-Edwin Friedrich
- Language: German
- Year: 1995
- Author: Hans Edwin Friedrich
- Language: German
- Year: 2011
- Author: Hans-Edwin Friedrich
- Language: German