6Domyei,Z. The psychology of the language learner:individual differences in second language acquisition[M]. Mahwah, N.J. : Lawrence Erlbaum., 2005.
7Dornyei ,Z. The psychology of second language acquisition[M]. Oxford:Oxford University Press ,2009.
8Higgins,E.T. Promotion and prevention:regulatory focus as a motivational principle[J]. Advances in Experimental Social Psychology, 1998 ( 30 ) : 1-46.
9Markus,H.R.,& Ruvolo,A. Possible selves:personalized representations of goals. In L.A. Pervin(ed.)Goal Conceptsin Personality and Social Psychology (pp. 211-241 ) [ M ]. Hillsdale, NJ : Lawrence Erlbaum, 1989.
10Vroom, V. 1964. Work and Motivation [M]. New.York: Wiley.
