1 2 Hugh R. Leavell and E. Gurney Clark as "the science and art of preventing disease, prolonging life, and promoting physical and mental health and efficiency. Leavell, H. R., & Clark, E. G. (1979). Preventive Medicine for the Doctor in his Community (3rd ed.). Huntington, NY: Robert E. Krieger Publishing Company.
↑ Mokdad A. H., Marks J. S., Stroup D. F., Gerberding J. L. (2004). "Actual Causes of Death in the United States, 2000". Journal of the American Medical Association. 291 (10): 1238–1245. doi:10.1001/jama.291.10.1238.CS1 maint: Multiple names: authors list (link)
