Cita APA

Bowler, B., & Bill Bowler; Sarah Cunningham. (1999). New Headway Pronunciation Course: Upper Intermediate. Oxford: Oxford University Press.

Chicago Style Citation

Bowler, Bill, i Bill Bowler; Sarah Cunningham. New Headway Pronunciation Course: Upper Intermediate. Oxford: Oxford University Press, 1999.

Cita MLA

Bowler, Bill, i Bill Bowler; Sarah Cunningham. New Headway Pronunciation Course: Upper Intermediate. Oxford: Oxford University Press, 1999.