United States. Congress. Senate. Special Committee on Aging, American Association of Retired Persons, Federal Council on the Aging (U.S.), & U.S. Administration on Aging. (1991). Aging America: Trends and projections : 1991 edition (1991 edition.). U.S. Department of Health and Human Sevices.
芝加哥风格引文United States. Congress. Senate. Special Committee on Aging, American Association of Retired Persons, Federal Council on the Aging (U.S.), 与 U.S. Administration on Aging. Aging America: Trends and Projections : 1991 Edition. 1991 edition. Washington: U.S. Department of Health and Human Sevices, 1991.
MLA引文United States. Congress. Senate. Special Committee on Aging, et al. Aging America: Trends and Projections : 1991 Edition. 1991 edition. U.S. Department of Health and Human Sevices, 1991.