- Author: Richard O. Gray, Christopher J. Corbally
- Language: English
- Year: 2021
- Author: Richard T. Gray
- Language: German
- Year: 1987
- Author: Richard Mackenzie-Gray Scott
- Language: English
- Year: 2022
- Author: Richard T. Gray
- Language: English
- Year: 2017
- Author: Richard O. Gray Christopher J. Corbally
- Language: English
- Year: 2009
- Author: Richard T. Gray
- Language: English
- Year: 2017
- Author: Richard O. Gray Christopher J. Corbally
- Language: English
- Year: 2009
- Author: Richard O. Gray Christopher J. Corbally
- Language: English
- Year: 2009
- Author: Drake Richard Lee, Gray Henry, Mitchell Adam W. M., Vogl Wayne
- Language: English
- Year: 2015
- Author: Richard T. Gray Nicholas Halmi Gary J. Handwerk
- Language: English
- Year: 2011