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1.

Hidden Costs of Reward: New Perspectives on the Psychology of Human Motivation

Hidden Costs of Reward: New Perspectives on the Psychology of Human Motivation by Lepper, Mark R., Greene, David ISBN: 9780470264874 List Price: $16.50

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2.

Hidden Costs of Reward : New Perspectives on the Psychology of Human Motivation

Hidden Costs of Reward : New Perspectives on the Psychology of Human Motivation by Lepper, Mark R., Greene, David ISBN: 9781138954304

3.

The Hidden Costs of Reward: New Perspectives on the Psychology of Human Motivation

The Hidden Costs of Reward: New Perspectives on the Psychology of Human Motivation by Lepper, Mark R., Greene, David ISBN: 9781138954403 List Price: $56.95

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