Willett, W. (1998). Nutritional epidemiology (2nd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Willett, Walter. Nutritional Epidemiology. 2nd ed. New York: Oxford University Press, 1998.
Lua MLA (8ú heag.)Willett, Walter. Nutritional Epidemiology. 2nd ed. Oxford University Press, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.