Soars, J., & Soars, L. (1989). Headway advanced: Student's Book. New York: Oxford University Press.
Trích dẫn kiểu ChicagoSoars, John, và Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.
Deismireacht MLASoars, John, và Liz Soars. Headway Advanced: Student's Book. New York: Oxford University Press, 1989.
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