- Author: Cedric Linder, Leif Östman, Douglas A. Roberts, Per-Olof Wickman, Gaalen Ericksen, Allan MacKinnon
- Language: English
- Year: 2010
- Author: Bisson Douglas R., Roberts Clayton, Roberts David
- Language: English
- Year: 2016
- Author: Douglas S. Roberts
- Language: English
- Year: 2008