Lua APA (7ú heag.)

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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