Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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