1Gardner, R. C. Language anxiety: Its relationship to other anxieties and to processing in native and second languages [ J]. Language Learning 41:513 -534. 1991b. 被引量：1
2Gardner, R. W. Attitudes and Motivation in Second Language Learning [ M ]. Rowley, Mass : Newbury House, 1972. 被引量：1
3Krashen, S. D Second Language Acquisition and Second language learning [ M ]. Oxford : Pergamon Press, 1981. 被引量：1
