References

Eisenberger, R. and Cameron, J. Detrimental Effects of Reward: Reality or Myth? American Psychologist, 1996, 51 (11), 1153-1166.

Lepper, M. R., Greene, D., and Nisbett, R. E. Undermining children's intrinsic interest with extrinsic rewards: A test of the "overjustification" hypothesis. Journal of Personality and Social Psychology, 1973, 28, 129-137.