- Author: Uwe Backes, Steffen Kailitz
- Language: German
- Year: 2013
- Author: Uwe Backes, Steffen Kailitz
- Language: German
- Year: 2020
- Author: Uwe Backes Steffen Kailitz
- Language: English
- Year: 2016
- Author: Uwe Backes, Steffen Kailitz
- Language: English
- Year: 2015