SOURCE MATERIAL AND RECOMMENDED READING
Allen, Thomas B. 2008. Declassified: 50 Top Secret Documents That Changed History. Washington, D.C.: National Geographic.
Allen, Thomas B., and Norman Polmar. 2004. Spy Book: The Encyclopedia of Espionage, 2nd ed. New York: Random House.
Armstrong, Willis C., William Leonhart, William J. McCaffrey, and Herbert C. Rothenbert. 1984. “The Hazards of Single-Outcome Forecasting.” Studies in Intelligence, 28, no. 3: 57–70.
Barth, Jack. 2004. The Handbook of Practical Spying. Washington, D.C.: National Geographic. Introduction by Peter Earnest.
Bull, George. “The Elicitation Interview.” Studies in Intelligence, 14, no. 2 (Fall 1970): 115–122.
Clarridge, Duane. 1977. A Spy for All Seasons. New York: Scribner.
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