3Jacob,L. Cooperative learning: Context and opportunities for acquiring academic English[J]. TESOL Quarterly. 1996.
4Sharan. S. Cooperative learning in small group: Recent methods and effects on achievement, attitudes, and ethnic relations [J].Review of Educational Research , 1980.
5Flanigan. O. B. Peer tutoring and second language acquisition in the elementary school[J]. Applied Linguistics. 1991.
6Piaget, J. The Language and Thought of the Child[M]. New York: Harcourt Brace. 1950.
7Vygotsky, L. S. Thought and Language[M]. Cambridge. MA:The MIT Press.1978.
8Hymes. D. On Communicative Competence [M]. Philadelphia.PA: University of Pennsylvania Press. 1972.
9Swain, M. Understanding input through output[J]. Paper Presented at the Tenth University of Michigan Conference on Applied Linguistics. 1983.
10Pearce P L, Packer I. Minds on the move: New links from psychology to tourism [ J]. Annals of Tourism Research, 2013, 40:386 -411.
