APA引文

Lougheed, L. (2020). Barron's IELTS (Sixth edition.). Barron's.

芝加哥风格引文

Lougheed, Lin. Barron's IELTS. Sixth edition. New York, NY: Barron's, 2020.

MLA引文

Lougheed, Lin. Barron's IELTS. Sixth edition. Barron's, 2020.

警告：这些引文格式不一定是100％准确.