Citazione Stile APA (7a Edizione)

Soars, J., & Soars, L. (1987). Headway: Student's book. Upper-intemediate. Oxford University Press.

Citazione stile Chigago Style (17a edizione)

Soars, John, e Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford: Oxford University Press, 1987.

Citatione MLA (9a ed.)

Soars, John, e Liz Soars. Headway: Student's Book. Upper-intemediate. Oxford University Press, 1987.