Dyfyniad APA

Kelsey, J. L. (1996). Methods in observational epidemiology (2nd ed.). Oxford University Press.

Dyfyniad Arddull Chicago

Kelsey, Jennifer L. Methods in Observational Epidemiology. 2nd ed. New York: Oxford University Press, 1996.

Dyfyniad MLA

Kelsey, Jennifer L. Methods in Observational Epidemiology. 2nd ed. Oxford University Press, 1996.

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