Lougheed, L. (2020). Barron's IELTS (Sixth edition.). Barron's.
Chicagoスタイル(17版)引用形式Lougheed, Lin. Barron's IELTS. Sixth edition. New York, NY: Barron's, 2020.
MLA(9版)引用形式Lougheed, Lin. Barron's IELTS. Sixth edition. Barron's, 2020.
警告: この引用は必ずしも正確ではありません.