6Brown, H. D. M & Ms for language classrooms? Another look at motivation[ AJ. In J. E. Alatis (Ed.), Georgetown University round table on language and linguistics [ C ]. Washington, DC: Georgetown University Press, 1990.
7Brown, H. D. Teaching by Principles: An Interactive Approach to Language Pedagogy [ M ]. New Jersey : Prentice Hall, 1994.
8Deci,E. L. & Ryan, R. M. Intrinsic Motivation and Self- Determination in Human Behavior[ M]. New York: Plenum, 1985.
9Dickinson, L. Autonomy and motivation: A literature review [ J]. System, 1995 (2).
10Domyei, Z. Conceptualizing motivation in foreign language learning[ J ]. Language Learning, 1990,40:45 - 78.