4Keh C L. Feedback in the writing process: A model and methods for implementation [J]. EL T Journal, 1990(4).
5Mendonca C,Johnson K E. Peer review negotiations: revision activities in ESL Writing Instruction [J]. TESOL Quar- terly, 1994(4).
6Villamil O S, De Guerroro M C M. Assessing the impact of peer revision on L2 writing [J]. Applied Linguistics, 1998 (4).
7Berg E C. The effects of trained peer response on ESL student's revison tpys and writing quality [J].Journal oSecond Language Writing, 1999(8).
8Tsui A B M,Ng M. Do secondary L2 writers benefit from peer comments? [J].Journal ofSecond Language Writing, 2000(2).
9Liu J,Sadler R W. The effect and affect of peer review in electric versus traditional modes on L2 writing [J]. Journal of English for Academic Purpose, 2003(2).
10Hattie J, Temperley H. The power of feedback. [J].Review of Educational Research, 2007(1).