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“The 4-H program assistant's role”. Journal of Extension 13(4): 11-18. https://archives.joe.org/joe/1975july/1975-4-a2.pdf
. 1975. C
“Competencies needed by 4-H volunteers for the effective use of incentives: A needs assessment study”. Incentives in 4-H Monograph Series.
. 1975. “Competencies needed by 4-H volunteers for the use of incentives”. Incentives in 4-H Monograph Series. Raleigh, NC: North Carolina State University. https://files.eric.ed.gov/fulltext/ED114667.pdf
. 1975. M
. 1985.