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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Congress. Senate. Special Committee on Aging, American Association of Retired Persons, Federal Council on the Aging (U.S.), و U.S. Administration on Aging. Aging America: Trends and Projections : 1991 Edition. 1991 edition. Washington: U.S. Department of Health and Human Sevices, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.