Cita APA (7th ed.)

Soars, L., & Soars, J. (1998). New Headway: English course, Upper intermediate Student's book. Oxford University Press.

Cita Chicago (17th ed.)

Soars, Liz, i John Soars. New Headway: English Course, Upper Intermediate Student's Book. Oxford: Oxford University Press, 1998.

Cita MLA (9th ed.)

Soars, Liz, i John Soars. New Headway: English Course, Upper Intermediate Student's Book. Oxford University Press, 1998.