5Krashen S. The Input Hypothesis : Issues and Implications [M]. London. Longman, 1985.
6Swain M. Communicative Competence: Some Roles of Comprehensible Input and Comprehensible Output in Its Development [A]. S Gass, C Madden (eds.). Input in Second Language Acquisition [C]. Rowley, Mass. : Newbury House, 1985.
7Ellis R. Understanding Second Language Acquisition [M]. Oxford: Oxford University Press, 1985.
8Tudor I. The Dynamics of the Language Classroom [M]. Cambridge: Cambridge University Press, 2001.
9Harmer J. The Practice of English Language Teaching [M]. Harlow:Longman, 1991.
10Karavas-Dukas E. An Investigation into Teachers' Perceptions of Their Roles in the Classroom [M]. (Unpublished research). Coventry: University of Warwick, 1995.