- Author: Ralph Jürgen Bährle (auth.)
- Language: German
- Year: 2010
- Author: Ralph Jürgen Bährle (auth.)
- Language: German
- Year: 2017
- Author: Ralph Jürgen Bährle (auth.)
- Language: German
- Year: 2004
- Author: Ralph Jürgen Bährle (auth.)
- Language: German
- Year: 2010
- Author: Ralph Jürgen Bährle (auth.)
- Language: German
- Year: 2010