Cita APA

Soars, J., & Soars, L. (1988). Headway - Upper-intermediate: Student's book. Oxford: Oxford University Press.

Chicago Style Citation

Soars, John, i Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.

Cita MLA

Soars, John, i Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.