International Epidemiological Association, ebrary, Inc, & Porta, M. S. (2008). A dictionary of epidemiology (5th ed.). Oxford University Press.

International Epidemiological Association, Inc ebrary, and Miquel S. Porta. A Dictionary of Epidemiology. 5th ed. Oxford ; New York: Oxford University Press, 2008.

International Epidemiological Association, et al. A Dictionary of Epidemiology. 5th ed. Oxford University Press, 2008.