Roland Benabou and Jean Tirole, «Intrinsic and Extrinsic Motivation,» Review of Economic Studies. Vol. 70 (2003).
44
Edward L. Deci, Richard Koestner, & Richard M. Ryan, «Extrinsic Rewards and Intrinsic Motivation in Education: Reconsidered Once Again,» Review of Educational Research. Vol. 71. No. 1 (Spring 2001).