Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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