APA (7e ed.) Bronvermelding

Soars, J., & Soars, L. (1987). Headway: Student's book. Upper-intemediate. Oxford University Press.

Chicago (17e ed.) Bronvermelding

Soars, John, en Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford: Oxford University Press, 1987.

MLA (9e ed.) Bronvermelding

Soars, John, en Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford University Press, 1987.