Cunningham, S., & Sarah Cunningham; Bill Bowler. (1999). New Headway Pronunciation Course: Intermediate. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoCunningham, Sarah, và Sarah Cunningham; Bill Bowler. New Headway Pronunciation Course: Intermediate. Oxford: Oxford University Press, 1999.
MLA citiranjeCunningham, Sarah, và Sarah Cunningham; Bill Bowler. New Headway Pronunciation Course: Intermediate. Oxford: Oxford University Press, 1999.
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