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(2011-02-23). Reproductive and Perinatal Epidemiology. : Oxford University Press. Retrieved 20 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195387902.001.0001/acprof-9780195387902.
Reproductive and Perinatal Epidemiology. : Oxford University Press, 2011-02-23. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195387902.001.0001/acprof-9780195387902.
Buck Louis GM, Platt RW. Reproductive and Perinatal Epidemiology. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195387902.001.0001/acprof-9780195387902. Accessed May 20, 2013.