APA (7th ed.) Citation

Duffy, M. A. (1991). Physicians' Desk Reference: PDR. Medical Economics Co.

Chicago Style (17th ed.) Citation

Duffy, Marjorie A. Physicians' Desk Reference: PDR. Oradell, N.J.: Medical Economics Co, 1991.

MLA (9th ed.) Citation

Duffy, Marjorie A. Physicians' Desk Reference: PDR. Medical Economics Co, 1991.