Black, M. (2006). Objective IELTS Student's Book. Intermediate. Cambridge University Press.
Trích dẫn kiểu ChicagoBlack, Michael. Objective IELTS Student's Book. Intermediate. Cambridge University Press, 2006.
Deismireacht MLABlack, Michael. Objective IELTS Student's Book. Intermediate. Cambridge University Press, 2006.
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