Soars, L., Soars, J., & Maris, A. (2012). New Headway: Pre-Intermediate Teacher's Book (cuarta edición.). Oxford University Press.

Soars, Liz, John Soars, and Amanda Maris. New Headway: Pre-Intermediate Teacher's Book. cuarta edición. Oxford, United Kingdom: Oxford University Press, 2012.

Soars, Liz, et al. New Headway: Pre-Intermediate Teacher's Book. cuarta edición. Oxford University Press, 2012.