APA (7th ed.) Zitazioa

Willett, W. (1990). Nutritional epidemiology. Oxford University Press.

Chicago Style (17th ed.) Zitazioa

Willett, Walter. Nutritional Epidemiology. New York: Oxford University Press, 1990.

MLA (9th ed.) Zitazioa

Willett, Walter. Nutritional Epidemiology. Oxford University Press, 1990.