Lougheed, L. (2020). Barron's IELTS (Sixth edition.). Barron's.
Lua i Stíl Chicago (17ú heag.)Lougheed, Lin. Barron's IELTS. Sixth edition. New York, NY: Barron's, 2020.
Lua MLA (9ú heag.)Lougheed, Lin. Barron's IELTS. Sixth edition. Barron's, 2020.
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