- Author: Christopher Douglas
- Language: English
- Year: 2011
- Author: Christopher Douglas
- Language: English
- Year: 2016
- Author: Arthur Bartels, Christopher Douglas, André Henriques
- Language: English
- Year: 2019
- Author: Christopher Douglas
- Language: English
- Year: 2011
- Author: Dawson Christopher, Douglas Mary, Scott Christina
- Language: English
- Year: 2012
- Author: Christopher Douglas
- Language: English
- Year: 2016
- Author: Elizabeth Hanson-Hoffman Christopher Douglas Hoffman
- Language: English
- Year: 1998