Kelsey, J. L. (1996). Methods in observational epidemiology (2nd ed.). Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Kelsey, Jennifer L. Methods in Observational Epidemiology. 2nd ed. New York: Oxford University Press, 1996.
Lua MLA (8ú heag.)Kelsey, Jennifer L. Methods in Observational Epidemiology. 2nd ed. Oxford University Press, 1996.
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