Keith Jeffery, MI6: The History of the Secret Intelligence Service 1909-1949, London: New York : Bloomsbury, 2010.
Christopher Andrew, The Defence of the Realm: The Authorized History of MI5, London: New York : Allen Lane, 2009.
Biographies of members of the Cambridge Five
Literary and film portrayals of the Cambridge Five
John le Carré (David Cornwell), The Spy Who Came in from the Cold, The Constant Gardener, Tinker Taylor Soldier Spy, The Little Drummer Girl, The Honourable School Boy, etc.