1. Harden VA. A short history of the National Institutes of Health. Available at: URL: http://www.nih.gov/od/museum/exhibits/history/main.html. Accessed 2001 May 7
2. US Food and Drug Administration. Milestones in US food and drug law history. Available at: URL: http://www.fda.gov/opacom/backgrounders/miles.html. Accessed 2001 May 7
3. Medical ethics relating to clinical investigations using human subjects;Webster;Arch Dermatol,1999
4. Experiments and observations on the gastric juice and the physiology of digestion;Beaumont,1833
5. Frontier doctor: William Beaumont: America’s first great medical scientist;Horseman,1996