ebrary, Inc, Martin, L. G., & Preston, S. H. (1994). Demography of aging. National Academy Press.
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Dyfyniad Arddull Chicago
ebrary, Inc, Linda G. Martin, and Samuel H. Preston. Demography of Aging. Washington, D.C.: National Academy Press, 1994.
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Dyfyniad MLA
ebrary, Inc, et al. Demography of Aging. National Academy Press, 1994.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.