APA-referens (7:e uppl.)

Soars, L., Soars, J., & Griggs, k. (2019). Headway: Intermediate Teacher´s guide. Oxford University Press.

Chicago-referens (17:e uppl.)

Soars, Liz, John Soars, och katherine Griggs. Headway: Intermediate Teacher´s Guide. Oxford: Oxford University Press, 2019.

MLA-referens (9:e uppl.)

Soars, Liz, et al. Headway: Intermediate Teacher´s Guide. Oxford University Press, 2019.