Soars, L., & Soars, L. (2012). New headway intermediate student's book (4th ed.). Oxford University Press.

Soars, Liz, and Liz Soars. New Headway Intermediate Student's Book. 4th ed. Oxford: Oxford University Press, 2012.

Soars, Liz, and Liz Soars. New Headway Intermediate Student's Book. 4th ed. Oxford University Press, 2012.