4Bailey, Kathleen M. 1995. " Competitiveness and anxiety in adult second language lesming: Looking at and through the diary studies" in Brown, H. D. & Gonzo, S. (ed.) Readings on Second Language Acquisition. New Jersey: Prentice Hall.
5Brown, H. Douglas. 1994. Principles of Language Learning and Teaching. New Jersey, Prentice Hall.
6Ellis, Rod. 1994. The Study of Second Language Acquisition. Oxford: Oxford University Press.
7Matthews, Gerald. 1999. "Personality and skill: A cognitive-adaptive framework" in Ackerman et 01 (eel.) Learning and Individual Differences: Process, Trait, and Content Determinants. Washington D. C. : American Psychological Association.
8Stern, H. H. 1983. Fundamental Concepts of Language Teaching. Oxford: Oxford University Press.
9Ziv, Avner. 1984. Personality and Sense of Humor.New York: Springer Publishing Company.