- Author: Manfred Balz
- Language: German
- Year: 1980
- Author: Helmut Heiss
- Language: German
- Year: 1999
- Author: Herbert Kronke
- Language: German
- Year: 1988
- Author: Max-Planck-Institut f. Privatrecht (editor) Dietmar Baetge
- Language: German
- Year: 1994
- Author: Paul H. Neuhaus
- Language: German
- Year: 1976
- Author: Walter Jellinek
- Language: German
- Year: 2021
- Author: Peter Schlechtriem
- Language: German
- Author: Franz Zehetner
- Language: German
- Year: 1900
