- Author: Kurt Bergerhof Manfried Dietrich Oswald Loretz Johannes C. de Moor
- Language: German
- Year: 1969
- Author: Manfried Dietrich Oswald Loretz
- Language: German
- Year: 2013
- 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: Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1998
- Author: Manfried Dietrich Oswald Loretz
- Language: German
- Year: 1991
- Author: Manfried Dietrich Oswald Loretz
- Language: German
- Year: 2003