Sharpe, P. J. (1977). Barron's how to prepare for the TOEFL test of English as a foreign language (Fourth edition.). Barron's Educational Series.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sharpe, Pamela J. Barron's How to Prepare for the TOEFL Test of English as a Foreign Language. Fourth edition. Woodbury, N.Y.: Barron's Educational Series, 1977.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sharpe, Pamela J. Barron's How to Prepare for the TOEFL Test of English as a Foreign Language. Fourth edition. Barron's Educational Series, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.