- Author: Karl-Dieter Opp
- Language: English
- Year: 2020
- Author: Karl-dieter Opp, Peter Hartmann
- Language: English
- Year: 1989
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 2002
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 2014
- Author: Kurt Mühler Karl-Dieter Opp (auth.)
- Language: German
- Year: 2006
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 2005
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 1997
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 1995
- Author: Karl-Dieter Opp (auth.)
- Language: German
- Year: 1999