Cita APA (7th ed.)

Fletcher, R. H., & Fletcher, S. W. (2005). Clinical epidemiology: The essentials (4th ed.). Lippincott Williams & Wilkins.

Cita Chicago (17th ed.)

Fletcher, Robert H., i Suzanne W. Fletcher. Clinical Epidemiology: The Essentials. 4th ed. Philadelphia: Lippincott Williams & Wilkins, 2005.

Cita MLA (8th ed.)

Fletcher, Robert H., i Suzanne W. Fletcher. Clinical Epidemiology: The Essentials. 4th ed. Lippincott Williams & Wilkins, 2005.