Soars, J., & Soars, L. (1988). Headway - Upper-intermediate: Student's book. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoSoars, John, và Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
MLA引文Soars, John, và Liz Soars. Headway - Upper-intermediate: Student's Book. Oxford: Oxford University Press, 1988.
警告：这些引文格式不一定是100％准确.