Cita APA

Soars, J., & Soars, L. (1989). Headway: Advanced : Student's Book. Oxford: Oxford University Press.

Chicago Style Citation

Soars, John, i Liz Soars. Headway: Advanced : Student's Book. Oxford: Oxford University Press, 1989.

Cita MLA

Soars, John, i Liz Soars. Headway: Advanced : Student's Book. Oxford: Oxford University Press, 1989.