Lougheed, L. (2010). Barron's IELTS: International Language Testing System (2nd ed.). Barron's Educational Series, Inc.
Citace podle Chicago (17th ed.)Lougheed, Lin. Barron's IELTS: International Language Testing System. 2nd ed. Hauppauge, N.Y: Barron's Educational Series, Inc, 2010.
Citace podle MLA (9th ed.)Lougheed, Lin. Barron's IELTS: International Language Testing System. 2nd ed. Barron's Educational Series, Inc, 2010.
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