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[4] Rivers, W.M. (1987) "Principles of Interactive Language Teaching.” Interactive Language Teaching. Ed. Wilga M. Rivers. Cambridge: Cambridge University Press.
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[6] Widdowson, Henry G. (1992) "ELT and EL Teacher." ELT Journal 46/4.
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[8] Richard, J.C. (2006). ”Communicative Language Teaching Today.” Cambridge University Press
