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Haiwan yang digunakan dalam pengintipan

Jenkins, Peter. Surveillance Tradecraft: The Professional's Guide to Surveillance Training ISBN 978-0-9535378-2-2

Felix, Christopher [pseudonym for James McCarger]  A Short Course in the Secret War, 4th Edition. Madison Books, November 19, 2001.

West, Nigel. MI6: British Secret Intelligence Service Operations 1909–1945  1983

Smith Jr., W. Thomas. Encyclopedia of the Central Intelligence Agency 2003

Richelson, Jeffery T.  The U.S. Intelligence Community  1999   fourth edition

Richelson, Jeffery T.  A Century of Spies: Intelligence in the Twentieth Century 1977

Owen, David. Hidden Secrets: A Complete History of Espionage and the Technology Used to Support It

O'Toole, George. Honorable Treachery: A History of U.S. Intelligence, Espionage, Covert Action from the American Revolution to the CIA  1991

Lerner, Brenda Wilmoth & K. Lee Lerner, eds. Terrorism: essential primary sources  Thomas Gale  2006  ISBN 978-1-4144-0621-3

Lerner, K. Lee and Brenda Wilmoth Lerner, eds.  Encyclopedia of Espionage, Intelligence and Security  2003  1100 pages.

Knightley, Philip The Second Oldest Profession: Spies and Spying in the Twentieth Century  Norton  1986

Kahn, David. The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet  1996  Revised edition. First published in 1967.

Johnson, Robert. Spying for Empire: The Great Game in Central and South Asia, 1757–1947  London: Greenhill  2006

Friedman, George. America's Secret War: Inside the Hidden Worldwide Struggle Between the United States and Its Enemies 2005

Doyle, David W., A Memoir of True Men and Traitors (2000)

Tunney, Thomas Joseph and Paul Merrick Hollister Throttled!: The Detection of the German and Anarchist Bomb Plotters Boston: Small, Maynard & company  1919 | available on Wikisource: s:Throttled!

Beesly, Patrick. Room 40, 1982.

Burnham, Frederick Russell Taking Chances 1944

May, Ernest (ed.) Knowing One's Enemies: Intelligence Assessment before the Two World Wars 1984

Tuchman, Barbara W.  The Zimmermann Telegram  Ballantine Books 1966

Words: Matt Bolton; photographs: Matt Munro. "The Tallinn Cables: A Glimpse into Tallinn's Secret History of Espionage" . Lonely Planet Magazine, December 2011