Harrison, L., Snelling, R., & Travis, P. (2021). Practice tests for IELTS (First edition.). HarperCollins.
Chicagoスタイル(17版)引用形式Harrison, Louis, Rhona Snelling, , Peter Travis. Practice Tests for IELTS. First edition. New York: HarperCollins, 2021.
MLA(9版)引用形式Harrison, Louis, et al. Practice Tests for IELTS. First edition. HarperCollins, 2021.
警告: この引用は必ずしも正確ではありません.