- Author: Marcus Bieder, Guido Christensen, Stefan Ernst, Andreas Fuchs, Mathias Habersack, Carsten Schäfer, Harry Schmidt, Alexander Witt
- Language: German
- Year: 2016
- Author: Ann C. Christensen
- Language: English
- Year: 2021
- Author: Alicia Christensen, Tobias Wolff
- Language: English
- Year: 2010
- Author: Gesche Joost, Katharina Bredies, Michelle Christensen, Florian Conradi, Andreas Unteidig
- Language: English
- Year: 2016
- Author: Michael Asken, Dave Grossman, Loren W Christensen, Brad Thor
- Language: English
- Year: 2022
- Author: Cristi Christensen
- Language: English
- Year: 2021
