Citazione Stile APA (7a Edizione)

Soars L. Liz & Soars J. John. (1998). New Headway English Course. Upper-Intermediate: Workbook without key. Oxford, Oxford University Press, 1998.

Citazione stile Chigago Style (17a edizione)

Soars L. Liz e Soars J. John. New Headway English Course. Upper-Intermediate: Workbook Without Key. Oxford, Oxford University Press, 1998, 1998.

Citatione MLA (9a ed.)

Soars L. Liz e Soars J. John. New Headway English Course. Upper-Intermediate: Workbook Without Key. Oxford, Oxford University Press, 1998, 1998.