Travis, P., & Harrison, L. (2013). Practice tests for IELTS. HarperCollins Publishers.
Lua i Stíl Chicago (17ú heag.)Travis, Peter, agus L. Harrison. Practice Tests for IELTS. London: HarperCollins Publishers, 2013.
Lua MLA (9ú heag.)Travis, Peter, agus L. Harrison. Practice Tests for IELTS. HarperCollins Publishers, 2013.
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