1. Enemies of exploration: Self-initiated versus other-initiated learning;Condry;Journal of Personality and Social Psychology,1977
2. Intrinsic motivation and the process of learning;Condry,1978
3. Endogenous attribution and intrinsic motivation;Kruglanski,1978
4. The effects of extrinsic incentive on some qualitative aspects of task performance;Kruglanski;Journal of Personality,1971
5. Overjustification research and beyond: Toward a means-end analysis of intrinsic and extrinsic motivation;Lepper,1978