- Author: Rainer Guldin, Gustavo Bernardo
- Language: German
- Year: 2017
- Author: Rainer Guldin
- Language: German
- Year: 2014
- Author: Rainer Guldin
- Language: English
- Year: 2020
- Author: Rainer Guldin
- Language: English
- Year: 2015
- Author: Anke K. Finger Rainer Guldin Gustavo Bernardo
- Language: English
- Year: 2011