Cita APA

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

Citación estilo Chicago

Bowler, Bill, and Sarah Cunningham. New Headway Pronunciation Course: Upper-intermediate. Oxford: Oxford University Press, 1999.

Cita MLA

Bowler, Bill, and Sarah Cunningham. New Headway Pronunciation Course: Upper-intermediate. Oxford: Oxford University Press, 1999.