U.S. Department of Health, Education and Welfare: National Center for Health Statistics: Health in the Later Years of Life. DHEW Publication No. (HSM) 72-1207, p. 6.
2.
American Medical Association, Center for Health Services Research and Development, Reference Data on Socioeconomic Issues of Health, 1973 ed. Published by American Medical Association, Chicago: Table 7, p. 15. Average Remaining Years of Life at Specified Ages, Selected Years 1900-1971.