Sharpe, P. J. (2004). How to prepare for the TOEFL test: Test of English as a foreign language (11th ed.). Barron's.
Παραπομπή σε μορφή Chicago (17η εκδ.)Sharpe, Pamela J. How to Prepare for the TOEFL Test: Test of English as a Foreign Language. 11th ed. New York: Barron's, 2004.
Παραπομπή σε μορφή MLA (8th εκδ.)Sharpe, Pamela J. How to Prepare for the TOEFL Test: Test of English as a Foreign Language. 11th ed. Barron's, 2004.
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