Soars, L., Soars, J., & Wheeldon, S. (2006). New headway: Elementary : Workbook without key (3rd ed.). Oxford University Press.

Soars, Liz, John Soars, and Sylvia Wheeldon. New Headway: Elementary : Workbook Without Key. 3rd ed. Oxford: Oxford University Press, 2006.

Soars, Liz, et al. New Headway: Elementary : Workbook Without Key. 3rd ed. Oxford University Press, 2006.