Loungheed, L. (2011). Barron's IELTS: International English language testing system (2nd ed.). New Age Intenational.
Lua i Stíl Chicago (17ú heag.)Loungheed, Lin. Barron's IELTS: International English Language Testing System. 2nd ed. New Delhi: New Age Intenational, 2011.
Lua MLA (8ú heag.)Loungheed, Lin. Barron's IELTS: International English Language Testing System. 2nd ed. New Age Intenational, 2011.
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