- Author: Douglas H. Gordon, Norman L. Torrey
- Language: English
- Year: 2019
- Author: Teresa Douglas, Holly Gordon, Mike Webber
- Language: English
- Year: 2020
- Author: Stuart Douglas, Fee Gordon D
- Language: Czech, English
- Year: 2005
- Author: Stuart Douglas, Fee Gordon D.
- Language: Czech
- Year: 2005