(1993). Headway Upper-immediate: (Student's book). Oxford: Oxford University Press.
シカゴスタイル引用形Headway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.
MLA引用形式Headway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.
警告: この引用は必ずしも正確ではありません.