Gallagher, N., Nguyễn Văn Phước,, & Vũ Tài Hoa. (2004). Delta's key to the TOEFL test (New ed.). Tp.HCM: Nxb Trẻ.
Chicago Stili AlıntıGallagher, Nancy., Nguyễn Văn Phước, ve Vũ Tài Hoa. Delta's Key to the TOEFL Test. New ed. Tp.HCM: Nxb Trẻ, 2004.
MLA AlıntıGallagher, Nancy., Nguyễn Văn Phước, ve Vũ Tài Hoa. Delta's Key to the TOEFL Test. New ed. Tp.HCM: Nxb Trẻ, 2004.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..