APA Citatie

Soars, L., & Liz & John Soars with Jop Devoy. (1998). New Headway English Course: Upper-intermediate (Workbook with key). Oxford: Oxford University Press.

Chicago Style citaat

Soars, Liz, en Liz & John Soars with Jop Devoy. New Headway English Course: Upper-intermediate (Workbook With Key). Oxford: Oxford University Press, 1998.

MLA citatie

Soars, Liz, en Liz & John Soars with Jop Devoy. New Headway English Course: Upper-intermediate (Workbook With Key). Oxford: Oxford University Press, 1998.