- Author: Walther Hadding (editor), Klaus J. Hopt (editor)
- Language: German
- Year: 1993
- Author: Walther Hadding (editor), Klaus J. Hopt (editor), Herbert Schimansky (editor)
- Language: German
- Year: 2001
- Author: Walther Hadding (editor), Klaus J. Hopt (editor)
- Language: German
- Year: 1991