Cita APA (7th ed.)

Fletcher, R. H., Fletcher, S. W., & Wagner, E. H. (1996). Clinical epidemiology: The essentials (3rd ed.). Lippincott Williams & Wilkins.

Cita Chicago (17th ed.)

Fletcher, Robert H., Suzanne W. Fletcher, i Edward H. Wagner. Clinical Epidemiology: The Essentials. 3rd ed. Philadelphia: Lippincott Williams & Wilkins, 1996.

Cita MLA (9th ed.)

Fletcher, Robert H., et al. Clinical Epidemiology: The Essentials. 3rd ed. Lippincott Williams & Wilkins, 1996.