1. Danzig Richard, 2003. Catastrophic bioterrorism – What Is To Be Done? Center for Technology and National Security Policy, National Defense University, Washington, DC, August 2003.
2. Friedlander Arthur M., 1997. Anthrax. In: Zajtchuk, R. (Ed.), Textbook of Military Medicine: Medical Aspects of Chemical and Biological Warfare. US Dept. of the Army, Surgeon General, and the Borden Institute, Washington, DC, pp. 467–478.
3. Biological Weapons: From the Invention of State-sponsored Programs to Contemporary Bioterrorism;Guillemin,2005
4. Heyman David, Epstein Gerald, 2008. The Center for Strategic and International Studies Homeland Security Program, Washington, DC, Personal Communication.
5. Kadlec Robert P., 2009. The concept of the 4-D’s. Personal Communication.