Gaya APA

Friedman, G, D., Wilopo, S, A. (1993). Prinsip-Prinsip Epidemiologi . Yogyakarta: Yayasan Essentia Medica.

Gaya MLA

Friedman, Gary, D.., Wilopo, Siswanto, A.. "Prinsip-Prinsip Epidemiologi". Yogyakarta: Yayasan Essentia Medica, 1993. Book.