Sharpe, P. J. (2003). Practice exercises for the TOEFL: Test of English as a foreign language (5th ed.). Barron's.
Chicago-Zitierstil (17. Ausg.)Sharpe, Pamela J. Practice Exercises for the TOEFL: Test of English as a Foreign Language. 5th ed. Hauppauge, NY: Barron's, 2003.
MLA-Zitierstil (9. Ausg.)Sharpe, Pamela J. Practice Exercises for the TOEFL: Test of English as a Foreign Language. 5th ed. Barron's, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.