Gaya APA

Gary, F, D., Friedman,, D, G. (1993). PRINSIP-PRINSIP EPIDEMIOLOGI . London: Yayasan Essentia Medica.

Gaya MLA

Gary, Friedman, D.., Friedman,, D, Gary.. "PRINSIP-PRINSIP EPIDEMIOLOGI". London: Yayasan Essentia Medica, 1993. Text.