Lougheed, L. (2020). Barron's IELTS (Sixth edition.). Barron's.
Chicago Style (17th ed.) CitationLougheed, 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:這些引文格式不一定是100%准確.