APA Style

Ryan, K, J., Ray, C, G. (2003). Sherris Medical Microbiology: An Introduction to Infectious Diseases 4th Ed. (4). New York: McGraw-Hill.

MLA Style

Ryan, Kenneth, J.., Ray, C., George. "Sherris Medical Microbiology: An Introduction to Infectious Diseases 4th Ed.". 4 New York: McGraw-Hill, 2003. Text.