
- Author: Blansdorf Jurgen Blansdorf
- Language: German
- Year: 2020

- Author: Anja Glaab, Michael Albrecht
- Language: German
- Year: 2021

- Author: María Elisa Sala
- Language: Spanish, Castilian
- Year: 2015

- Author: Javier Velaza
- Language: English
- Year: 2016

- Author: Albrecht Michael Albrecht
- Language: German
- Year: 2019