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Swain, Merrill. (1985). Communicative competence: Some roles of comprehensible input and comprehensible output in its development. Gass, S. M. and C. G. Madden. Input in Second Language Acquisition. Rowley, MA: Newbury House. 235-253.

Turnbull, Jill. Review of Issues in English. CALICO Review. 12/99.

Wakabayashi, Setsuko and Jun-ya Morishita. (1994). "The Implications for Different Types of Help in Listening Comprehension with the Assistance of a Personal Computer." Conference Proceedings: 19th Congress of the Applied Linguistics Association of Australia, University of Melbourne.