
- Author: Professor Dr. Heinrich Holland Doris Holland (auth.)
- Language: German
- Year: 2004

- Author: Professor Dr. Heinrich Holland Doris Holland (auth.)
- Language: German
- Year: 2001

- Author: Prof.Dr. Heinrich Holland Doris Holland (auth.)
- Language: German
- Year: 1999

- Author: Heinrich Holland Doris Holland (auth.)
- Language: German
- Year: 1998

- Author: Heinrich Holland Doris Holland (auth.)
- Language: German
- Year: 1991