- 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