APA (7e ed.) Bronvermelding

Soars, L., Soars, J., & Hancock, P. (2019). Headway: Intermediate - Student's Book (quinta edición.). Oxford University Press.

Chicago (17e ed.) Bronvermelding

Soars, Liz, John Soars, en Paul Hancock. Headway: Intermediate - Student's Book. quinta edición. Oxford: Oxford University Press, 2019.

MLA (9e ed.) Bronvermelding

Soars, Liz, et al. Headway: Intermediate - Student's Book. quinta edición. Oxford University Press, 2019.