APA-viite (7. p.)

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

Chicago-viite (17. p.)

Soars, Liz, John Soars, ja Paul Hancock. Headway: Pre-Intermediate - Student's Book. Oxford, Unites Kingdom: Oxford University Press, 2019.

MLA-viite (9. p.)

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