Sharpe, P. J. (1994). Pass key to the TOEFL iBT: Test of English as a foreign language : internet-based test (6th ed.). United States of American: Barron's Educational Series, Inc.
Trích dẫn kiểu ChicagoSharpe, Pamela J. Pass Key to the TOEFL IBT: Test of English As a Foreign Language : Internet-based Test. 6th ed. United States of American: Barron's Educational Series, Inc, 1994.
Deismireacht MLASharpe, Pamela J. Pass Key to the TOEFL IBT: Test of English As a Foreign Language : Internet-based Test. 6th ed. United States of American: Barron's Educational Series, Inc, 1994.
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