Van Cleave, Michelle K. (April 2007). "Counterintelligence and National Strategy"(PDF). School for National Security Executive Education, National Defense University (NDU). Archived from the original(PDF) on 2007-11-28. Retrieved 2007-11-05.
Van Cleave, Michelle K. (April 2007). "Counterintelligence and National Strategy"(PDF). School for National Security Executive Education, National Defense University (NDU). Archived from the original(PDF) on 2007-11-28. Retrieved 2007-11-05.