- Author: Timothy D. Johnson, Michael Gray
- Language: English
- Year: 2015
- Author: Seligson Paul (edit.) Downie Michael Gray David.
- Language: English
- Author: Seligson Paul (edit.) Downie Michael Gray David.
- Language: English
- Author: Michael Gray (auth.)
- Language: English
- Year: 2014
- Author: Michael Gray (auth.)
- Language: English
- Year: 2014
- Author: Dr Jonathan Michael Gray
- Language: English
- Year: 2012
- Author: Michael Gray Baughan Michael Gray Baughan Gay Brewer
- Language: English
- Year: 2004
- Author: Michael Gray Baughan
- Language: English
- Year: 2008
- Author: Michael Gray Baughan
- Language: English
- Year: 2009
- Author: Michael Gray
- Language: English
- Year: 2006