- Author: Klein Stefan, Sosio Libero
- Language: Italian
- Year: 2019
- Author: Klein Stefan, Lehmann Stephen
- Language: English
- Year: 2006
- Author: Klein Stefan, Mitchell Mike
- Language: English
- Year: 2018
- Author: Klein Stefan
- Language: English
- Year: 2014
- Author: Klein Stefan
- Language: English
- Year: 2015
- Author: Klein Stefan
- Language: English
- Year: 2014
- Author: Klein Stefan, da Vinci Leonardo
- Language: German
- Year: 2014
- Author: Klein Stefan
- Language: German
- Year: 2017
- Author: Klein Stefan
- Language: German
- Year: 2002