Citazione APA

Soars, J., & Soars, L. (1987). Headway upper - intermediate: Student's Book. New York: Oxford University Press.

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.