Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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