6Bhela, B. 1999. Native language interference in learning a second language: Exploratory case studies of native language interference with target language usage [J]. International Education Journal 1/1.
7Chen, F. J. 1999. The role of first language transfer and second language proficiency in the writing of Chinese learners of English as a second language [D]. Dissertation Abstracts International DAI-A 60/-70:2412.
8Cumming, A. 1989. Writing expertise and second language proficiency [J]. Language Learning 39: 81-141.
9Cummins, J. 1983. Language proficiency and academic achievement [A]. In J. W. Oller, Jr. (ed.). Issues in Language Testing Research [ C]. Rowley,MA: Newbury House.
10Faerch, C. & G. Kasper. 1987. Perspectives on language transfer [J]. Applied Linguistics 8: 111-36.
