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7Hunter, Kathleen I. and Margaret W. Linn. 1981. "Psychosocial Differences between Elderly Volunteers and Non-Volunteers." International Journal of Aging and Human Development 12(3):205-13.
8Wheeler, Judith A., Kevin M. Gorey, and Bernard Greenblatt. 1998. "The Beneficial Effects of Volunteering for Older Volunteers and the People They Serve: A Meta-Analysis." International Journal of Aging and Human Development 47: 69-79.
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