ebrary, Inc, National Bureau of Economic Research Conference on the Economics of Aging, & Wise, D. A. (1990). Issues in the economics of aging. University of Chicago Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)ebrary, Inc, National Bureau of Economic Research Conference on the Economics of Aging, و David A. Wise. Issues in the Economics of Aging. Chicago: University of Chicago Press, 1990.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)ebrary, Inc, et al. Issues in the Economics of Aging. University of Chicago Press, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.