DESIGNING CLINICAL RESEARCH.. & HULLEY, S. B. [. (2001). Designing clinical research an epidemiologis approach.-- ed.2. Lippincott Williams and Wilkins.

DESIGNING CLINICAL RESEARCH.. and Stephen B. [et.al] HULLEY. Designing Clinical Research an Epidemiologis Approach.-- Ed.2. Philadelphia: Lippincott Williams and Wilkins, 2001.

DESIGNING CLINICAL RESEARCH.. and Stephen B. [et.al] HULLEY. Designing Clinical Research an Epidemiologis Approach.-- Ed.2. Lippincott Williams and Wilkins, 2001.