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^Gürbuz, U (2013), Future Trends and New Approaches in Defeating the Terrorism Threat, Nato Science for Peace and Security Series E: Human and Societal Dynamics, IOS Press, p. 114, ISBN978-1614992714
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^Cohen, Eliot A. (1995). "Review of Betrayal: The Story of Aldrich Ames, an American Spy; Dirty Tricks or Trump Cards: U.S. Counterintelligence and Covert Action". Foreign Affairs. 74 (5): 167. doi:10.2307/20047325. JSTOR20047325.
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