4Jennifer Hendedong, Mark R.Leeper. ( 2002 ). The effects of Praise on Children's Intrinsic Motivation: A Review and Synthesis, Psychology Bulletin, 128,774-795.
5Deci,E,L., Koestner,R.,&Ryan,R.M., (1999), A ,meta-analysis review of experiments examining the effects of extrinsic rewards on intrinsic motivation, Psychology Bulletin,125,627-668.
6Mueller, C,M., Dweck, c.s. ( 1998 ). Praise for intelligence can ucdermine children' s motivation and performance. Journal of Personality and Social Psychology.75,33-52.
