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  • Carlisle, Rodney, Ph.D. "The Complete Idiot's Guide to Spies and Espionage." Alpha, April 1, 2003. ISBN 0028644182.
  • Keeley, Jennifer. "American War Library - The Cold War: Espionage." Lucent Books, 1st edition, October 21, 2002. ISBN 1590182103.
  • Owen, David. "Spies: The Undercover World of Secrets, Gadgets and Lies." Firefly Books, September 2004. ISBN 1552977951.
  • "Spy." The American Heritage Dictionary of the English Language, 4th edition.
  • "Spy." Merriam-Webster Online Dictionary.
  • Volkman, Ernest. "Spies: The Secret Agents Who Changed the Course of History." Wiley, New edition, June 17, 1997. ISBN 0471193615.
  • Yancey, Diane. "Spies (History Makers)." Lucent Books, November 2001. ISBN 1560069589.