3Aitchison, J. 1987. Words in the Mind: An Introduction to the Mental Lexicon [M]. Oxford: Basil Blackwell.
4Anderson, J. R. 1995. Learning and Memory: An Integrated Approach [M]. New York: Wiley.
5Bygate, M. 2001. Effects of task repetition on the structure and control of oral language [A]. In M. Bygate, P. Skehan, & M. Swain (Eds.), Researching Pedagogic Tasks: Second Language Learning, Teaching, and Testing [C]. Oxford: Oxford University Press. pp. 23-48.
6Clark, J. M. & Paivio, A. 1991. Dual coding theory and education[J]. Educational Psychology Review, 3 (3): 149-170.
7Crookes, G. V. 1989. Planning and interlanguage variability [J]. Studies in Second Language Acquisition, 11: 367-383.
8Ellis. 1987. Interlanguage variability in narrative discourse: Style shifting in the use of the past tense [J]. Studies in Second Language Acquisition, 9: 12-20.
9Ellis, R. 2003. Task-based Language Learning and Teaching [M]. Oxford: Oxford University Press.
10Foster, P. & Skehan, P. 1996. The influence of planning on performance in task-based learning [J]. Studies in Second Language Acquisition, 18: 299-324.