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Joy, Barnard D. 1938. Who joins 4-H clubs?. Agricultural Extension Service Review 9(2): 21.
Joy, Barnard D. 1934. Some factors influencing length of 4-H club membership. Master's thesis, University of Maryland.
Joy, Barnard D. 1934. The length of 4-H club membership. Part 1.. National 4-H Fellowship Student.