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Чикаго-гийн эшлэл (17 дахь хэвлэлт)ebrary, Inc, National Bureau of Economic Research Conference on the Economics of Aging, ба David A. Wise. Studies in the Economics of Aging. Chicago: University of Chicago Press, 1994.
MLA -ийн эшлэл (9 дэх хэвлэлт)ebrary, Inc, et al. Studies in the Economics of Aging. University of Chicago Press, 1994.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.