APA

Soars J. a. L., Wheeldon S., . (2007). New Headway Pre-Intermediate. Workbook with key. Oxford: Oxford University Press.

Chicago

Soars John and Liz, Wheeldon S, . 2007. New Headway Pre-Intermediate. Workbook with key. Oxford: Oxford University Press.

Harvard

Soars J. a. L., Wheeldon S., . (2007). New Headway Pre-Intermediate. Workbook with key. Oxford: Oxford University Press.

MLA

Soars John and Liz, Wheeldon S, . New Headway Pre-Intermediate. Workbook with key. Oxford: Oxford University Press. 2007.