Murray, Christopher JL, and Alan D. Lopez. “Mortality by Cause for Eight Regions of the World: Global Burden of Disease Study.” The Lancet 349, no. 9061 (1997): 1269–1276.
 Murray, C.J., Lopez, A.D., 1997. Mortality by cause for eight regions of the world: Global Burden of Disease Study. The lancet 349, 1269–1276.