Relative efficacy of self-monitored and externally imposed reinforcement systems.
1967 ◽
Vol 7
(2, Pt.1)
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pp. 111-116
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2000 ◽
Vol 93
(10)
◽
pp. 962-965
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2001 ◽
Vol 158
(12)
◽
pp. 1989-1992
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1968 ◽
Vol 36
(1)
◽
pp. 49-66
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