Fletcher, R. H., & Fletcher, S. W. (2005). Clinical epidemiology: The essentials (4th ed.). Lippincott Williams & Wilkins.
Lua i Stíl Chicago (17ú heag.)Fletcher, Robert H., agus Suzanne W. Fletcher. Clinical Epidemiology: The Essentials. 4th ed. Philadelphia: Lippincott Williams & Wilkins, 2005.
Lua MLA (8ú heag.)Fletcher, Robert H., agus Suzanne W. Fletcher. Clinical Epidemiology: The Essentials. 4th ed. Lippincott Williams & Wilkins, 2005.
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