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“Motivations and selected characteristics of adult volunteers in Extension 4-H youth programs in Minnesota”. Doctoral diss., University of Minnesota. http://www.worldcat.org/oclc/5729980
. 1979. “Motivating the adult 4-H volunteer”. Journal of Extension 19(1): 19-27. https://archives.joe.org/joe/1999february/rb5.php
. 1981.