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�1o X= P� cott, J. (2002). “Bidirectional Transfer”, Applied Linguistic, 23, 2, pp: 190-214.
Roach, P. (2000). English Phonetics and Phonology, Cambridge: Cambridge University Press.
Richards, J., Platt, J. and Weber, H. (1985). Longman Dictionary of Applied Linguistics, England: Longman Group Limited.
Schachter, J. (1983). “A new account of language transfer”, in S. Gass and L. Selinker (eds.), Language transfer in language learning. Rowley, MA: Newbury House, pp. 98-111.
Schachter, J. (1992). “A new account of language transfer”, in S. Gass and L. Selinker (eds.), Language transfer in language learning, Amsterdam: John Benjamins, pp. 32-46.
Strain, J. E. (1968). “A Contrastive Sketch of the Persian and English Sound Systems”, IRAL 6.
Swan, M. and Smith, B. (eds.). (1987). Learner English: A Teacher’s Guide to Interference and Other Problems, Cambridge: Cambridge University Press.
Taylor, G. (1986). “Errors and explanations”, Applied Linguistics 7, pp. 144-166.
Whitman, R., and Jackson, K. (1972). The Unpredictability of Contrastive Analysis, Language Learning, 22, pp. 29-41.
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