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