APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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