
- Author: Hegel Georg Wilhelm Friedrich, Shanks Andrew
- Language: English
- Year: 2015

- Author: Clarke Matthew
- Language: English
- Year: 2013

- Author: Copan Paul, Meister Chad
- Language: English
- Year: 2013

- Author: Silke Dangel
- Language: German
- Year: 2014

- Author: Reinhard Flogaus Jennifer Wasmuth
- Language: German
- Year: 2015