1. Hall, JR (2009) The Total Cost of Fire in the United States. Quincy, MA: National Fire Protection Association.
2. ASTM International (2008) Annual Book of ASTM Standards: 2008, Vol. 04.11. West Conshohocken, PA: ASTM International.
3. International Code Council, Inc. (2009). International Building Code. Washington, DC: International Code Council, Inc.
4. National Institute of Standards and Technology (2008) Safer buildings are goal of new code changes based on recommendations from NIST world trade center investigation. TechBeat: October 1, 2008. http://www.nist.gov/public_affairs/releases/wtc_100108.html . Accessed 5 April 2010
5. United States General Services Administration (2007) Exit stair cost analysis. Washington, DC