- Author: Gerd Wotjak (editor), Heide Schmidt (editor)
- Language: German
- Year: 2019
- Author: Gerd Wotjak (editor)
- Language: Spanish, Castilian
- Year: 2019
- Author: Gerd Wotjak (editor)
- Language: Spanish, Castilian
- Year: 2019
- Author: Gerd Wotjak (editor)
- Language: Spanish, Castilian
- Year: 1992
- Author: Wolfgang Lorenz, Gerd Wotjak
- Language: German
- Year: 1978
- Author: Giovanni Rovere (editor), Gerd Wotjak (editor)
- Language: German
- Year: 1993
- Author: Gerd Wotjak (editor)
- Language: Spanish
- Year: 1994