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Value-Expressive Volunteer Motivation and Volunteering by O..:

Okun, Morris A. ; O'Rourke, Holly P. ; Keller, Brian..
The Journals of Gerontology Series B: Psychological Sciences and Social Sciences.  70 (2014)  6 - p. 860-870 , 2014
Link: https://doi.org/10.1093/geronb/gbu029