Gaya APA

Ryan, K, J. et al (1994). Sherris Medical Microbiology : An Introduction to Infectious diseases (Ed. 3). USA: Pretice-Hall Interatonal Inc..

Gaya MLA

Ryan, Kenneth, J.. et al. "Sherris Medical Microbiology : An Introduction to Infectious diseases". Ed. 3 USA: Pretice-Hall Interatonal Inc., 1994. Text.