2[1]Byrne,D. Integrating Skills[A]. In K. Johmson & K. Morrow(eds.). Communication in the Classroom[C]. Harlow: Longman,1981,108 - 114.
3[2]Krashen,S. Principles and Practices in Second Language Acquisition[M]. Oxford: Pergamon Press, 1982.
4[3]Nunan,D. Designing Tasks for the Communicative Classroom. Cambridge: Cambridge University Press,1989.
5[4]R. Ellis. Understanding Second Language Acquisition. Oxford: Oxford University Press,1986.
6[5]Swain, M. Commmicative competence: Some roles of comprehensible input and comprehensible output in its development [A]. In S. Gass & C. Maddens(eds.). Input in Second Language Acquisition[C]. Rowley,Mass: Newbury House,1985.
7[6]Swain, M. Three functions of output in second language learning[A]. In G. Cook & B. Seidlehofer(eds.). Principles and Practice in Applied Linguistics[C]. Oxford: Oxford University Press, 1995,125- 144.