Friis, R. H., & Sellers, T. A. (2009). Epidemiology for public health practice (4th ed.). Jones and Bartlett Publishers.
Lua i Stíl Chicago (17ú heag.)Friis, Robert H., agus Thomas A. Sellers. Epidemiology for Public Health Practice. 4th ed. Sudbury, Mass.: Jones and Bartlett Publishers, 2009.
Lua MLA (8ú heag.)Friis, Robert H., agus Thomas A. Sellers. Epidemiology for Public Health Practice. 4th ed. Jones and Bartlett Publishers, 2009.
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