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RATS PREFERENCE FOR EARNED IN COMPARISON WITH FREE LIQUID REINFORCERS
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[3]
PREFERENCE FOR BAR PRESSING OVER FREELOADING AS A FUNCTION OF NUMBER OF REWARDED PRESSES
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JOURNAL OF EXPERIMENTAL PSYCHOLOGY,
1963, 65 (05)
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[5]
PREFERENCE FOR BAR PRESSING TO OBTAIN REWARD OVER FREELOADING IN RATS AND CHILDREN
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JOURNAL OF COMPARATIVE AND PHYSIOLOGICAL PSYCHOLOGY,
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:320-&