Citazione Stile APA (7a Edizione)
Soars, J., & Soars, L. (1994). Headway. Teacher's Book: Pre-Intermediate. Includes Test Booklet (4.impression.). Oxford University Press.
Citazione stile Chigago Style (17a edizione)
Soars, John, e Liz Soars. Headway. Teacher's Book: Pre-Intermediate. Includes Test Booklet. 4.impression. Oxford: Oxford University Press, 1994.
Citatione MLA (9a ed.)
Soars, John, e Liz Soars. Headway. Teacher's Book: Pre-Intermediate. Includes Test Booklet. 4.impression. Oxford University Press, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.