Katz, D. L., & Jekel, J. F. (2014). Jekel's epidemiology, biostatistics, preventive medicine, and public health (4th ed.). Saunders.
Lua i Stíl Chicago (17ú heag.)Katz, David L., agus James F. Jekel. Jekel's Epidemiology, Biostatistics, Preventive Medicine, and Public Health. 4th ed. Philadelphia, Pa. ; London: Saunders, 2014.
Lua MLA (8ú heag.)Katz, David L., agus James F. Jekel. Jekel's Epidemiology, Biostatistics, Preventive Medicine, and Public Health. 4th ed. Saunders, 2014.
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