APA
Ryan K. J., Ray C. George & Sherris R. K. (2004). Sherris medical microbiology. New York: McGraw-Hill.
Chicago
Ryan Kenneth J, Ray C. George and Sherris Ryan K. 2004. Sherris medical microbiology. New York: McGraw-Hill.
Harvard
Ryan K. J., Ray C. George and Sherris R. K. (2004). Sherris medical microbiology. New York: McGraw-Hill.
MLA
Ryan Kenneth J, Ray C. George and Sherris Ryan K. Sherris medical microbiology. New York: McGraw-Hill. 2004.