Cullen, P. (2008). Cambridge Vocabulary for IELTS. New York: Cambridge University Press.
Trích dẫn kiểu ChicagoCullen, Pauline. Cambridge Vocabulary for IELTS. New York: Cambridge University Press, 2008.
Deismireacht MLACullen, Pauline. Cambridge Vocabulary for IELTS. New York: Cambridge University Press, 2008.
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