Cohen, E. (1994) Designing groupwork: Strategies for the heterogeneous classroom. New York: Teachers College Press.
Collier, V. (1989) How long? A synthesis of research on academic achievement in a second language. TESOL Quarterly, 23, 3, 509-531.
Foley, J. (1991) A psycholinguistic framework for task-based approaches to language teaching. Applied Linguistics. 12, 1, 62-75.
Lindfors, J. (1989) The classroom: A good environment for language learning. in P. Rigg and V. Allen (Eds) When they all don't speak English. Urbana, IL: National Council of Teachers of English.
Oxford, R. (1990) Language learning strategies: What every teacher should know. New York: Newbury House.
Reyes, M. (1992) Challenging venerable assumptions: Literacy instruction for linguistically different students. Harvard Educational Review. 62, 4, 427- 446.
Rubin, J. and Thompson, I. (1982) How to be a more successful language learner. Boston, MA: Heinle & Heinle.
Schmidt, R. and Frota, S. (1986) Developing basic conversational ability in a second language: A case study of an adult learner of Portuguese. In Day, R. (ed.) Talking to learn: Converation in second language acquisition. Rowley, MA: Newbury House.
Vygotsky, L. (1979) Mind in Society. Cambridge, MA: Harvard U. Press.