Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Soars, Liz, y John Soars. New Headway: English Course. Upper Intermediate. Teacher's Book. London: Oxford University, 1998.

Cita MLA (8a ed.)

Soars, Liz, y John Soars. New Headway: English Course. Upper Intermediate. Teacher's Book. Oxford University, 1998.