SAMET, JONATHAN M., THOMAS A. BURKE, and LYNN GOLDMAN. "Regulating Carcinogens." Cancer Epidemiology and Prevention. : Oxford University Press, 2006-10-12. Oxford Scholarship Online. 2009-09-01. Date Accessed 24 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-72>.
SAMET, J., BURKE, T., & GOLDMAN, L.(2006-10-12). Regulating Carcinogens. In Cancer Epidemiology and Prevention. : Oxford University Press. Retrieved 24 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195149616.001.0001/acprof-9780195149616-chapter-72.
SAMET, JONATHAN M., THOMAS A. BURKE, and LYNN GOLDMAN. "Regulating Carcinogens." 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-72.
SAMET JM, BURKE TA, GOLDMAN L. Regulating Carcinogens. 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-72. Accessed May 24, 2013.