Gaya APA

keppel, G. (2013). Epidemiology Kept Simple: an Introducing to Traditional and Modern Epidemiology (Ed.3). UK: john wiley & son.

Gaya MLA

keppel, Geoffrey. "Epidemiology Kept Simple: an Introducing to Traditional and Modern Epidemiology". Ed.3 UK: john wiley & son, 2013. Text.