- Author: Nigel West
- Language: English
- Year: 2005
- Author: Great Britain. MI5, Melville William, Cook Andrew
- Language: English
- Year: 2011
- Author: Great Britain. MI5, Hutton Robert, Roberts Eric
- Language: English
- Year: 2018
- Author: Great Britain. MI5, Smith James
- Language: English
- Year: 2013