Willett, W. (1998). Nutritional epidemiology (2nd ed.). Oxford University Press.
Chicago Style aipamenaWillett, Walter. Nutritional Epidemiology. 2nd ed. New York: Oxford University Press, 1998.
MLA aipamenaWillett, Walter. Nutritional Epidemiology. 2nd ed. Oxford University Press, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.