6Deci E L,Koestner R,Ryan R M. A meta-analytic re-view of experiments examining the effects of extrinsicrewards on intrinsic motivation [J]. Psychological Bul-letin, 1999, 125 (6) ; 627-668.
7Zusho A,Pintrich P R. Skill and will: the role of motiva-tion and cognition in the learning of college chemistry [J].International journal of science educational, 2003,25(9): 1081-1094.
8Linnenbrink E A,Pintrich P R. The role of self-efficacybeliefs in student engagement and learning in the class-room [J]. Reading &- writing quarterly,2003,19(2):119-137.