APA
(2006). The Merck Manual of Diagnosis and Therapy. New Jersey: Merck Research Laboratory.
Chicago
2006. The Merck Manual of Diagnosis and Therapy. New Jersey: Merck Research Laboratory.
Harvard
(2006). The Merck Manual of Diagnosis and Therapy. New Jersey: Merck Research Laboratory.
MLA
The Merck Manual of Diagnosis and Therapy. New Jersey: Merck Research Laboratory. 2006.