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Hopkins BL. Effects of candy and social reinforcement, instructions, and reinforcement schedule leaning on the modification and maintenance of smiling. J Appl Behav Anal. 1968;1(2):121-9doi: 10.1901/jaba.1968.1-121.
Hopkins, B. L. (1968). Effects of candy and social reinforcement, instructions, and reinforcement schedule leaning on the modification and maintenance of smiling. Journal of applied behavior analysis, 1(2), 121-9. https://doi.org/10.1901/jaba.1968.1-121
Hopkins, B L. "Effects of candy and social reinforcement, instructions, and reinforcement schedule leaning on the modification and maintenance of smiling." Journal of applied behavior analysis vol. 1,2 (1968): 121-9. doi: https://doi.org/10.1901/jaba.1968.1-121
Hopkins BL. Effects of candy and social reinforcement, instructions, and reinforcement schedule leaning on the modification and maintenance of smiling. J Appl Behav Anal. 1968;1(2):121-9. doi: 10.1901/jaba.1968.1-121. PMID: 16795167; PMCID: PMC1310987.
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