1. Clausewitz, Carl von. 1976.On War, Edited by: Howard, Michael and Paret, Peter. 101Princeton: Princeton University Press.
2. Andrew, Christoper. 1988. “Historical Research on the British Intelligence Community,”.
3. Godson, ed. 1988.Comparing Foreign Intelligence: The United States, the Soviet Union, the United Kingdom, and the Third World, 43–64. New York: Pergamon Brassey's.