Intrinsic and Extrinsic Motivations: Classic Definitions and New DirectionsRichard M. Ryan(University of Rochester), Edward L. Deci(University of Rochester)Contemporary Educational PsychologyJanuary 1, 200010.1006/ceps.1999.1020Cited by 18,040SaveCiteExport RISWatch citationsAbstractRelated PapersIntrinsic Motivation and Self-Determination in Human BehaviorEdward L. Deci, Richard M. Ryan|Unknown|1985|25.8kScience and Human BehaviorErnest Kilzer, B. F. Skinner|The American Catholic Sociological Review|1953|9kHelplessness: On Depression, Development, and DeathMartin E. P. Seligman|CERN Document Server (European Organization for Nuclear Research)|1975|6.3kMotivation reconsidered: The concept of competence.Robert W. White|Psychological Review|1959|5.5kEffects of externally mediated rewards on intrinsic motivation.Edward L. Deci|Journal of Personality and Social Psychology|1971|4.1k