APA
(1977). Medical Letter on Drogs and Therapeutics. New Rochele: Medical Letter Inc.
Chicago
1977. Medical Letter on Drogs and Therapeutics. New Rochele: Medical Letter Inc.
Harvard
(1977). Medical Letter on Drogs and Therapeutics. New Rochele: Medical Letter Inc.
MLA
Medical Letter on Drogs and Therapeutics. New Rochele: Medical Letter Inc. 1977.