Gaya APA

Friis, R, H., Selleres, T, A. (2009). Epidemiology for Public Healt Practice (fourth edition). London: Jones and Bartlett Publishers, INC.

Gaya MLA

Friis, Robert, H.., Selleres, Thomas, A.. "Epidemiology for Public Healt Practice". fourth edition London: Jones and Bartlett Publishers, INC, 2009. Text.