APA

Bowler B., Cunningham S., . (2003). New Headway Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press.

Chicago

Bowler B, Cunningham S, . 2003. New Headway Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press.

Harvard

Bowler B., Cunningham S., . (2003). New Headway Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press.

MLA

Bowler B, Cunningham S, . New Headway Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press. 2003.