
- Author: Wolfgang Becker Robert Ebner Daniela Fischer-Petersohn Marcus Ruhnau (auth.)
- Language: German
- Year: 2015

- Author: Wolfgang Becker Robert Holzmann (auth.)
- Language: German
- Year: 2014

- Author: Dr. Wolfgang Becker (auth.)
- Language: German
- Year: 1989

- Author: Wolfgang Becker Norbert Schöll (auth.)
- Language: German
- Year: 1983