Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.