Citazione Stile APA (7a Edizione)

Soars, L., & Soars, J. (2004). New Headway English course: Elementary : student's book.

Citazione stile Chigago Style (17a edizione)

Soars, Liz, e John Soars. New Headway English Course: Elementary : Student's Book. Oxford, 2004.

Citatione MLA (9a ed.)

Soars, Liz, e John Soars. New Headway English Course: Elementary : Student's Book. 2004.