Soars, J., & Soars, L. (1991). Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press.
シカゴスタイル引用形Soars, John, , Liz Soars. Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press, 1991.
MLA引用形式Soars, John, , Liz Soars. Headway: Pre-Intermediate : Student's Book. Oxford: Oxford University Press, 1991.
警告: この引用は必ずしも正確ではありません.