3Deci E L, Porac J F. Cognitive evaluation theory and the study of human motivation[M]//Lepper M R, Greene D.The hid- den eosts of reward Hillsdale. N J: Erlbaum, 1978:149-176.
4Deci E I,, Ryan R M. The empirical exploration of intrinsic motivational processes[M]//Berkowilz L. Advances in experimen- tal social psychology.NewYork: Academie Press, 1980:39-80.
5Deci E L, Ryan R M.Intrinsic motivation and self-deternina- tion in human behavior[M]. New York: Plenum, 1985.
6Boal K B, Cummings L L. Cognitive evaluation theory: An experimental test of processes and outcomes[J]. Organizational Behavior and Human Performance, 1981 (28) : 289-310.
