Jekel, J. F. K. (2007). Epidemiology biostatistics, and preventive medicine (3rd. ed.). Saunders Elsevier.
Lua i Stíl Chicago (17ú heag.)Jekel, James F. Katz. Epidemiology Biostatistics, and Preventive Medicine. 3rd. ed. Philadelphia: Saunders Elsevier, 2007.
Lua MLA (8ú heag.)Jekel, James F. Katz. Epidemiology Biostatistics, and Preventive Medicine. 3rd. ed. Saunders Elsevier, 2007.
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