Sharpe, P. J., & Nguyễn, V. P. (2003). Practice exercises for the TOEFL test: Test of English as a foreign language (4th ed.). T.P. Hồ Chí Minh: Trẻ; Công ty Văn hóa Sáng tạo Trí Việt.
Παραπομπή Chicago StyleSharpe, Pamela J., και Văn Phước Nguyễn. Practice Exercises for the TOEFL Test: Test of English As a Foreign Language. 4th ed. T.P. Hồ Chí Minh: Trẻ; Công ty Văn hóa Sáng tạo Trí Việt, 2003.
Παραπομπή MLASharpe, Pamela J., και Văn Phước Nguyễn. Practice Exercises for the TOEFL Test: Test of English As a Foreign Language. 4th ed. T.P. Hồ Chí Minh: Trẻ; Công ty Văn hóa Sáng tạo Trí Việt, 2003.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.