1Cumming, A. Writing expertise and second language proficiency [ J ]. Language Learning, 1989 (39) : 81 - 141.
2Jones, S. Attention to rhetorical form while compos- ing in a second language. In Campbell, C. , V. Flashner, T. Hudson, and J. Lubin, Proceedings of the Los Angeles Sec- ond Language Research Forum, Vol. 2:130- 143 . Los An- geles: University of California at Los Angeles, 1982.
3Judy,S. N. & S. J. Judy. An Introduction to the Teach- ing of Writing[M]. Illinois: Scott Foresman Company, 1981.
4Keh, C. L. Feedback in the writing process: A model and methods for implementation [ J ]. ELT Journal, 1990(4) :294 - 304.
5Sasaki, M. & K. Hirose. Explanatory variables for EFL students' expository writing [ J ]. Language Learning, 1996(46) : 137 - 174.
6Zamel, V. The composing process of advanced ESL students: Six case studies I J]. TESOL Quarterly, 1983 (17) :165 -187.
7Zamel V. Teaching composition in the ESL class- room: What we can learn from research in the teaching of English[J]. TESOL Quarterly, 1976(10).
