MI6: British Secret Intelligence Service Operations, 1909–1945

Cold War Spymaster: The Legacy of Guy Liddell, Deputy Director of MI5

The A to Z of British Intelligence

At Her Majestys Secret Service: The Chiefs of Britains Intelligence Service, MI6

GCHQ: The Secret Wireless War, 1900–1986

Secret War: The Story of SOE, Britain's Wartime Sabotage Organisation

MI5: British Security Service Operations, 1909–1945: The True Story of the Most Secret counter-espionage Organisation in the World

Historical Dictionary of Cold War Counterintelligence

Churchill's Spy Files: MI5's Top-Secret Wartime Reports

The A to Z of Sexspionage

Cold War Counterfeit Spies: Tales of Espionage; Genuine or Bogus?

Historical Dictionary of Naval Intelligence

Spycraft Secrets: An Espionage A-Z

Double Cross in Cairo: The True Story of the Spy Who Turned the Tide of War in the Middle East

Hitler's Nest of Vipers: The Rise Of The Abwehr

Hitler's Nest of Vipers: The Rise Of The Abwehr

Hitler's Trojan Horse: The Fall of the Abwehr, 1943–1945

Historical Dictionary of Sexspionage

Historical Dictionary of British Intelligence: Edition 2

Encyclopedia of Political Assassinations