Reagan, Mark L., ed. (May 2, 2011). "Agent of Influence"(PDF). Terms & Definitions of Interest for DoD Counterintelligence Professionals (Report). p. GL-4. Archived from the original(PDF) on 2012-04-17.
Reagan, Mark L., ed. (May 2, 2011). "Agent of Influence"(PDF). Terms & Definitions of Interest for DoD Counterintelligence Professionals (Report). p. GL-4. Archived from the original(PDF) on 2012-04-17.