Cita APA (7th ed.)

Bowler, B. (1999). New headway pronunciation: Upper-intermediate. Oxford University Press.

Cita Chicago (17th ed.)

Bowler, Bill. New Headway Pronunciation: Upper-intermediate. Oxford: Oxford University Press, 1999.

Cita MLA (9th ed.)

Bowler, Bill. New Headway Pronunciation: Upper-intermediate. Oxford University Press, 1999.