Black, M. (2006). Objective IELTS. Advanced: Self-study student's book. Cambridge: Cambridge University Press.
Παραπομπή Chicago StyleBlack, Michael. Objective IELTS. Advanced: Self-study Student's Book. Cambridge: Cambridge University Press, 2006.
Παραπομπή MLABlack, Michael. Objective IELTS. Advanced: Self-study Student's Book. Cambridge: Cambridge University Press, 2006.
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