APA-referens (7:e uppl.)

Porta, M. (2008). A dictonary of epidemiology (5th.). Oxford University.

Chicago-referens (17:e uppl.)

Porta, Miquel. A Dictonary of Epidemiology. 5th. New York: Oxford University, 2008.

MLA-referens (8:e uppl.)

Porta, Miquel. A Dictonary of Epidemiology. 5th. Oxford University, 2008.