SCHOTTENFELD, DAVID, and JENNIFER L. BEEBE-DIMMER. "Multiple Primary Cancers." Cancer Epidemiology and Prevention. : Oxford University Press, 2006-10-12. Oxford Scholarship Online. 2009-09-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-66>.
SCHOTTENFELD, D., & BEEBE-DIMMER, J.(2006-10-12). Multiple Primary Cancers. In Cancer Epidemiology and Prevention. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-66.
SCHOTTENFELD, DAVID, and JENNIFER L. BEEBE-DIMMER. "Multiple Primary Cancers." In Cancer Epidemiology and Prevention. : Oxford University Press, 2006-10-12. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-66.
SCHOTTENFELD D, BEEBE-DIMMER JL. Multiple Primary Cancers. In: Schottenfeld D, Fraumeni JF. Cancer Epidemiology and Prevention. Oxford University Press; 2006. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-66. Accessed May 21, 2013.