Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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