Lougheed, L. Barron's ielts: International language testing system.
Chicagoスタイル(17版)引用形式Lougheed, Lin. Barron's Ielts: International Language Testing System. New Delhi New Age International 2007:.
MLA(9版)引用形式Lougheed, Lin. Barron's Ielts: International Language Testing System.
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