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Krashen, S., (1981). Second language acquisition and second language learning. Oxford: Pergamon.

Long (1991) to propose an approach which he termed Focus on Form instruction (henceforth FonF). Cambridge: Cambridge University Press.

Richards, J.C., & R. Schmidt. (2002). Dictionary of language teaching & and applied linguistics. Longman: Pearson Education

Larsen-Freeman, D. (2001).Grammar: The Cambridge guide to teaching English to speakers of other languages. Cambridge: Cambridge University Press

Cook, V. (2008). Second language teaching and learning. London: Hodder Education.