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Work, 19th Edition, Volume 3, pp. 2469-2470.
Giles Darvill & Brian Munday, 1984, Volunteers in the Personal Social Services, New York, Tavistock Publication, p. 3
Gorden Manser & Rosemary Cass, 1976, Voluntarism at the Crossroads, New York, Family Service Association of America, p.11.
M. C. Williams
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