1. Brown, H. D. Principles of language learning and teaching. 1994.
2. Koole, S. L. The psychology of emotion regulation: An integrative review. Psychology Press. 2010.
3. Mruk, C. J. Self-Esteem and Positive Psychology, 4th Edition: Research, Theory, and Practice. Springer Publishing Company. 2013: 294.
4. Heyde, A.W. The Relationship between self esteem and the oral production of a second language. Second Language: Trends in research and practice. INSTITUTION Teachers on English to Speakers of Other, 1979: 226.
5. Scovel, T. The effect of affect on foreign language learning:A review of the anxiety research. Language Learning. 1978.