Lougheed, L. (2007). Barron's IELTS: International English language testing system. TR.
Trích dẫn kiểu ChicagoLougheed, Lin. Barron's IELTS: International English Language Testing System. TR, 2007.
MLA citiranjeLougheed, Lin. Barron's IELTS: International English Language Testing System. TR, 2007.
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