Erber, J. T. (2005). Aging and older adulthood (ed.). Thomson.
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Dyfyniad Arddull Chicago
Erber, Joan T. Aging and Older Adulthood. ed. Belmont, California: Thomson, 2005.
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Dyfyniad MLA
Erber, Joan T. Aging and Older Adulthood. ed. Thomson, 2005.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.