United States Government Accountability Office, “Combating Terrorism: Foreign Terrorist Organization Designation Process and U.S. Agency Enforcement Actions”, GAO-15-629, (2015)
U.S. Intelligence Community & Department of Homeland Security & Department of Justice, Review of Domestic Sharing of Counterterrorism Information (2017. 3.)
U.S. Government Accountability Office, “Intelligence Community Personal: Strategic Approach and Training Requirements Needed to Guide Joint Duty Program,” GAO-12-679 (2012. 6.)
Thomas H. Kean, The 9/11 Commission Report, US Government Printing Office, 2011.