Sullivan, P. N., & Zhong, G. Y. Q. (1991). Supercourse for the TOEFL (2nd ed.). New York: Prentice Hall Press.
Trích dẫn kiểu ChicagoSullivan, Patricia Noble, và Grace Yi Qiu Zhong. Supercourse for the TOEFL. 2nd ed. New York: Prentice Hall Press, 1991.
MLA CitationSullivan, Patricia Noble, và Grace Yi Qiu Zhong. Supercourse for the TOEFL. 2nd ed. New York: Prentice Hall Press, 1991.
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