Friis, R. H., & Sellers, T. A. (2014). Epidemiology for public health practice (5th ed.). Jones & Bartlett Learning.
Lua i Stíl Chicago (17ú heag.)Friis, Robert H., agus Thomas A. Sellers. Epidemiology for Public Health Practice. 5th ed. Burlington, Mass.: Jones & Bartlett Learning, 2014.
Lua MLA (8ú heag.)Friis, Robert H., agus Thomas A. Sellers. Epidemiology for Public Health Practice. 5th ed. Jones & Bartlett Learning, 2014.
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