1. Arnold, J. (1999). Affect in language learning. Cambridge: Cambridge University Press.
2. Bandura, A. (1986). The explanatory and predictive scope of self-efficacy theory. Journal of Clinical and Social Psychology, 4, 359–373.
3. Beebe, L. M. (1983). Risk-taking and the language learner. In H. W. Selinger & M. H. Long (Eds.), Classroom oriented research in second language acquisition (pp. 311–327). Rowley, MA: Newbury House.
4. Carrell, P. L., Prince, M. S., & Astika, G. G. (1996). Personality type and language learning in an EFL context. Language Learning, 46, 75–99.
5. Costa, P. T., & McCrae, R. R. (1985). The NEO Personality Inventory Manual. Odessa, FL: Psychological Assessment Resources.