Gaya APA

Fletcher, R, H, F, S, W, A, W, E, H. (1988). Clinical Epidemiology (2). Baltimore, MD: Williams and Wilkins.

Gaya MLA

Fletcher, Robert, H., Fletcher,, Suzanne, W, And, Wagner,, Edward, H. "Clinical Epidemiology". 2 Baltimore, MD: Williams and Wilkins, 1988. Text.