Sharpe, P. J., & Nguyễn Văn Phước. (2000). Practice exercises for the Toefl: Text of English as (Fourth edition.). Tp. HCM: Trẻ.
Chicago Stili AlıntıSharpe, Pamela J., ve Nguyễn Văn Phước. Practice Exercises for the Toefl: Text of English As. Fourth edition. Tp. HCM: Trẻ, 2000.
MLA AlıntıSharpe, Pamela J., ve Nguyễn Văn Phước. Practice Exercises for the Toefl: Text of English As. Fourth edition. Tp. HCM: Trẻ, 2000.
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