MLA

Beeson, Paul B, et al. Cecil-loeb Textbook of Medicine. 13th ed. Philadelphia: Saunders, 1971.

APA

Beeson, P. B, Cecil, R. L, Loeb, R. Frederick, & McDermott, W. (1971). Cecil-Loeb Textbook of medicine. 13th ed. Philadelphia: Saunders.

Chicago

Cecil, Russell L., and Robert Frederick Loeb. Cecil-Loeb Textbook of Medicine. Edited by Paul B Beeson and Walsh McDermott. 13th ed. Philadelphia: Saunders, 1971.