- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz Johannes C. de Moor
- Language: German
- Year: 1969
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1987
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz Johannes C. de Moor
- Language: German
- Year: 1970
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1976
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz Johannes C. de Moor
- Language: German
- Year: 1971
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1986
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1980
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1979
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1981
- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1989