- Author: Kaiser Joseph H.
- Language: German
- Year: 1949
- Author: Kaiser Joseph H.
- Language: German
- Year: 1978
- Author: Ehmke Horst, Kaiser Joseph H., Kewenig Wilhelm A., Meessen Karl Matthias, Rüfner Wolfgang
- Language: German
- Year: 1973
- Author: Kaiser Joseph H.
- Language: German
- Year: 1959