3[1]Kumaradivelu B. Language-learning tasks: teacher intention and learner interpretation[J]. ELT Journal 1991,45(2):98-107.
4[2]Nunan D. Designing Tasks for the Communicative Classroom[M]. Cambridge: Cambridge University Press. 1989.
5[3]Pica T, Kanagy R, and Falodun J. Choosing and using communicative tasks for second language instruction[A]. G Crookes and S M Gass (eds.) .Tasks and Language Learning: Integrating Theory and Practice[Z]. Clevedon, Avon: Multilinggual Matters.1993.
6[4]Richards J C and Rodgers T S.Approaches and Methods in Language Teaching[M]. Cambridge: Cambridge University Press.1986.
7[5]Skehan P. A Cognitive Approach to Language Learning[M]. Oxford: Oxford University Press.1998.
8[6]Widdowson H G. Aspects of Language Teaching[M]. Oxford: Oxford University Press.1990.
9[7]Williams M, Bueden R L. Psychology for Language Teachers[M]. Cambridge: Cambridge University Press.1997.