1. Bureau of the Census. Current population reports: Population projections of the United States by age, sex, race, and Hispanic origin: 1995–2050. Washington, DC: U.S. Department of Commerce, Economics and Statistics Administration, Bureau of the Census; 1996.
2. U.S. Senate Special Committee on Aging. Developments in aging, 1987. Washington, DC: U.S. Government Printing Office; 1988, vol. I.
3. The second fifty years,1990
4. Disability in basic life activities across the life span;LaPlante,1989
5. Persons with chronic conditions;Hoffman;J Am Med Assoc,1996