• Defender’s Edge: Utilizing Intelligent Agent Technology To Anticipate Terrorist Acts by L. B. Scheiber, Institute for Defense Analyses, June 2003
• 2003 Report to Congress on Combatting Terrorism, Office of Management and Budget, September 2003
• 2002 Report to Congress on Combatting Terrorism, Office of Management and Budget, September 2001
• National Strategy for Combating Terrorism, National Security Council, February 14, 2003
• Terrorism, the Future, and U.S. Foreign Policy (PDF), Congressional Research Service.
• Fact Sheet: Foreign Terrorist Organizations, as of October 11, 2002.
• Significant Terrorist Incidents, 1961-2001: A Chronology, Department of State, October 31, 2001.
• FBI: Most Wanted Terrorists, October 10, 2001.
• State Department List of Foreign Terrorist Organizations, published October 5, 2001.
• Countering the Threat of International Terrorism, Report of the National Commission on Terrorism, June 2000.
• US Government Interagency Domestic Terrorism Concept of Operations Plan, January 2001. Installation Preparedness for Weapons of Mass Destruction, Installation Commander's Blueprint, U.S. Army, May 2001
• Will Duct Tape and Plastic Really Work? Issues Related To Expedient Shelter-In-Place, Oak Ridge National Laboratory, August 2001
• Report of the DoD Commission on the USS Cole, January 9, 2001. (PDF Version)
• Terrorist Organizations and Other Para-State Entities (FAS)
• The Sociology and Psychology of Terrorism: Who Becomes a Terrorist and Why?, Federal Research Division, Library of Congress, September 1999.

Taken from http://www.fas.org/irp/threat/terror.htm