7Ehrman M E, Leaver B L, Oxford R L. A brief overview of individual differences in second language learning. System, 2003, 31:313- 330.
8Midori Kimura. Affective Factors of Japanese EFL Learners at Junior College in the Oral Communication Tasks.
9Horwitz E K, Horwitz M B, Cope J. Foreign Language classroom anxiety. The Modem Language Journal, 1986, 70:125 - 132.
10Aida Y. Examination of Horwitz, Horwitz, and Cope's construct of foreign language anxiety: The case of students of Japanese. Modem Language Journal, 1994,78:155- 168.