(2012). The Official Guide to The TOEFL Test Fourth Edition (Ada CD). Mc GrawHill.
Lua i Stíl Chicago (17ú heag.)The Official Guide to The TOEFL Test Fourth Edition (Ada CD). Mc GrawHill, 2012.
Lua MLA (8ú heag.)The Official Guide to The TOEFL Test Fourth Edition (Ada CD). Mc GrawHill, 2012.
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