7Ellis.Rod.1985.Understanding Second Language Acquisition.Shanghai:ShanghaiForeign Language Education Press.
8Freeman.D.1992.Collaboration Constructing Shared Understandings in a Second Language Classroom.In D.Nunan (Ed.).Collaborative language Learning and Teaching.Cambridge:Cambridge University Press.
9Krashen.S.1982.Principle and Practice in Second Language Acquisition.Oxford:Pergamon.
10Schumann.F.and J.Schumann.1977."Diary of a Language Learner:an introspective Study of Second Language Learning" in H.Brown.C.Yorio.And R.Crymes (eds.) On TESOL' s 77.Washington D.C.:TESOL.
