Sharpe, P. J. (2010). Barron's TOEFL iBT: Internet-based test ; [most up-to-date review and practice tests currently available ...] (13th ed.). Barron's Educational Series.
Chicago-Zitierstil (17. Ausg.)Sharpe, Pamela J. Barron's TOEFL IBT: Internet-based Test ; [most Up-to-date Review and Practice Tests Currently Available ...]. 13th ed. Hauppauge, NY: Barron's Educational Series, 2010.
MLA-Zitierstil (9. Ausg.)Sharpe, Pamela J. Barron's TOEFL IBT: Internet-based Test ; [most Up-to-date Review and Practice Tests Currently Available ...]. 13th ed. Barron's Educational Series, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.