Cita APA (7th ed.)

Travis, P., & Harrison, L. (2013). Practice tests for IELTS. HarperCollins Publishers.

Cita Chicago (17th ed.)

Travis, Peter, i L. Harrison. Practice Tests for IELTS. London: HarperCollins Publishers, 2013.

Cita MLA (9th ed.)

Travis, Peter, i L. Harrison. Practice Tests for IELTS. HarperCollins Publishers, 2013.

Atenció: Aquestes cites poden no estar 100% correctes.