APA

Bowler B., Cunningham S., . (2001). New Headway. Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press.

Chicago

Bowler B, Cunningham S, . 2001. New Headway. Pronunciation Course. Upper-Intermediate. Oxford: Oxford University Press.

Harvard

Bowler B., Cunningham S., . (2001). 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. 2001.