Dunn, V., & Gruber, D. (1987). Listening: Intermediate. New York: Oxford University Press.
Trích dẫn kiểu ChicagoDunn, Viviane., và Diann Gruber. Listening: Intermediate. New York: Oxford University Press, 1987.
Deismireacht MLADunn, Viviane., và Diann Gruber. Listening: Intermediate. New York: Oxford University Press, 1987.
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