- Author: Greefrath Gilbert Maass Katja (Hrsg.)
- Language: German
- Year: 2020
- Author: Irene Grafenhofer Jürgen Maaß
- Language: German
- Year: 2019
- Author: Rita Borromeo Ferri Werner Blum
- Language: German
- Year: 2018
- Author: Hans-Stefan Siller Gilbert Greefrath Werner Blum
- Language: German
- Year: 2018
- Author: Stanislaw Schukajlow Werner Blum
- Language: German
- Year: 2018
- Author: Hans Humenberger Martin Bracke (eds.)
- Language: German
- Year: 2017