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5 Tolkien, J. R. R, "The lord of the rings: The fellowship of the ring" Harper Collins 2001
6 Krashen, S, "The input hypothesis: Issues and implications" Longman 1985
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8 Lantolf, J. P, "Sociocultural theory and second language learning: Introduction to the special issue" 78 (78): 418-420, 1994
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