Lougheed, L. (2010). Barron's ielts: International language testing system (Second edition.). Barron's Educational Series.
Chicagoスタイル(17版)引用形式Lougheed, Lin. Barron's Ielts: International Language Testing System. Second edition. Hauppauge: Barron's Educational Series, 2010.
MLA(9版)引用形式Lougheed, Lin. Barron's Ielts: International Language Testing System. Second edition. Barron's Educational Series, 2010.
警告: この引用は必ずしも正確ではありません.