1Krashen,S.D.The Input Hypothesis:Issues and Implications[M].London:Longman,1985.
2Swain,M.Communicative Competence:Some Roles of Comprehensible Input and Comprehensible Output in its Development[A].In S.Gass & C.Madden (eds.).Input in SLA[C].Rowley,MA:Newbury House,1985:235-253.
3Swain,M.Three functions of output in second language learning[A].In G.Cook & B.Seidlhofer (eds.).Principle and Practice in Applied Linguistics[C].Oxford:Oxford University Press,1995:125-144.
4De Bot, K. The psycholinguistics of the output hypothesis[J].Language Learning , 1996(46): 529-555.
5DeKeyser, R. M. &Sokalski, K. J. The differential role of comprehension and production practice[J]. Language Learning, 2001(51):81-112.
6Izumi, S. , & Bigelow, M. Does output promote noticing and second language acquisition?[J]. TESOL Quarterly, 2000(34) :239-278.
7Krashen, S. D. The Input Hypothesis: Issues and Implications[M]. London: Longman, 1985.
8Long, M. The role of the linguistic environment in second language acquisition[A]. In Ritchie, W. , Bhatia, T. J. (Eds.).Handbook of Second Language Acquisition[C]. Academic Press,Orlando, 1996:413-468.
9Nobuyoshi, J. , & Ellis, R. Focused communication tasks[J].English Language Teaching Journal, 1993(47):203-210.
10Pica, T. , Holliday, L. , Lewis, N. , & Morgenthaler, L. Comprehensible output as an outcome of linguistic demands on the learner [J ]. Studies in Second Language Acquisition, 1989 (11 ):63-90.