Incoming Resources
- The enemy within, a history of espionage, Terry Crowdy
- The secret state, a history of intelligence and espionage, Colonel John Hughes-Wilson
- Strange days indeed, the 1970s : the golden age of paranoia, Francis Wheen
- The secret world, a history of intelligence, Christopher Andrew
- Dark invasion, 1915: Germany's secret war and the hunt for the first terrorist cell in America, Howard Blum
- The secret war, spies, ciphers, and guerrillas 1939-1945, Max Hastings