APA引文

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

芝加哥风格引文

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

MLA引文

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

警告：这些引文格式不一定是100％准确.