1. D O'Leary “Prepared witness testimony: A review of federal bioterrorism preparedness programs from a public health perspective,” Subcommittee on Oversight and Investigations, House Committee on Energy and Commerce (Oct 10, 2001) http://com-notes.house.gov/107/hearings/10102001Hearing390/OLeary627.htm
2. “History of biological warfare, “Think Quest Internet Challenge Library http://library.thinkquest.org/21659/agents/history.html
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4. JB Tucker “Historical trends related to bioterrorism: An empirical analysis,” Emerging Infectious Diseases http://www.cdc.gov/nci-dod/eid/vol5no4/tucker.htm