- Author: Elton T.E. Barker, Stefan Bouzarovski, Christopher Pelling, Leif Isaksen
- Language: English
- Year: 2016
- Author: Elton T. E. Barker, Joel Christensen
- Language: English
- Year: 2013
- Author: Elton T. E. Barker
- Language: English
- Year: 2009
- Author: Elton T. E. Barker
- Language: English
- Year: 2009