Bowler, B. (1999). New headway pronunciation: Upper-intermediate. Oxford University Press.
Tohutoru Kātū Chicago (17th ed.)Bowler, Bill. New Headway Pronunciation: Upper-intermediate. Oxford: Oxford University Press, 1999.
Tohutoro MLA (9th ed.)Bowler, Bill. New Headway Pronunciation: Upper-intermediate. Oxford University Press, 1999.
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