1. 9/11 commission report: The official report of the 9/11 commission and related publications. (2004). Washington, D.C.: Government Printing Office.
2. Allan, R. T. & McConnaughey, D. (2007). More against footnotes. United States, Central Intelligence Agency. Retrieved from www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol8no4/html/v08i4a09p_0001.htm
3. Analysis, War, and Decision: Why Intelligence Failures Are Inevitable