APA (7th ed.) Citation

Soars, J. &. L. (1991). Headway: Pre-intermediate(student's book). Oxford University Press.

Chicago Style (17th ed.) Citation

Soars, John & Liz. Headway: Pre-intermediate(student's Book). Oxford, Inglaterra: Oxford University Press, 1991.

MLA (9th ed.) Citation

Soars, John & Liz. Headway: Pre-intermediate(student's Book). Oxford University Press, 1991.

Warning: These citations may not always be 100% accurate.