Lougheed, L., & Lin Lougheed. (2007). Barron's IELTS: International english language testing system. Tp. Hồ Chí Minh: Trẻ.
Trích dẫn kiểu ChicagoLougheed, Lin, và Lin Lougheed. Barron's IELTS: International English Language Testing System. Tp. Hồ Chí Minh: Trẻ, 2007.
Deismireacht MLALougheed, Lin, và Lin Lougheed. Barron's IELTS: International English Language Testing System. Tp. Hồ Chí Minh: Trẻ, 2007.
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