APA استشهاد

Robert H Friis. (2014). Epidemiology for public health practice (5.). Wiley.

استشهاد بنمط شيكاغو

Robert H Friis. Epidemiology for Public Health Practice. 5. UK: Wiley, 2014.

MLA استشهاد

Robert H Friis. Epidemiology for Public Health Practice. 5. Wiley, 2014.