APA (7th ed.) Zitazioa

Harrison, L., Snelling, R., & Travis, P. (2021). Practice tests for IELTS (First edition.). HarperCollins.

Chicago Style (17th ed.) Zitazioa

Harrison, Louis, Rhona Snelling, eta Peter Travis. Practice Tests for IELTS. First edition. New York: HarperCollins, 2021.

MLA (9th ed.) Zitazioa

Harrison, Louis, et al. Practice Tests for IELTS. First edition. HarperCollins, 2021.