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Krashen, S. (1994). The pleasure hypothesis. In Alatis, J. (ed.), Georgetwon University Round Table on Languages and Linguistics. Georgetown: Georgetown University Press, 299-322.

Long, M. (1996. The role of the linguistic environment in second language acquisition. In Ritchie, W.C. & Bhatia, T.K. (eds.), Handbook of Language Acquisition, Vol. 2. Second Language Acquisition.New York: Academic Press.

Pica, T., Young, R. & Doughty, C., 1987. The impact of interaction on comprehension. TESOL Quarterly, 21, 4, 737-758.

Swain, M. (1993). The Output Hypothesis: Just speaking and writing aren’t enough. The Canadian Modern Language Review. 50(1), 158-164.

Swain,M. (2000). The output hypothesis and beyond: Mediating acquisition through collaborative dialogue. In Lantolf, J.P. (ed.), Sociocultural theory and second language learning. 97-114. Oxford: Oxford University