Gaya APA

Ryan, K, J., Ray, C, G. (2003). Sherris medical microbiology : an introduction to infectious diseases (4th ed.). New York: McGraw-Hill.

Gaya MLA

Ryan, Kenneth, J.., Ray, C., George. "Sherris medical microbiology : an introduction to infectious diseases". 4th ed. New York: McGraw-Hill, 2003. Text.