GOWER, R. (1993). Speaking upper - intermediate. Oxford University Press.
Chicagoスタイル(17版)引用形式GOWER, Roger. Speaking Upper - Intermediate. Oxford: Oxford University Press, 1993.
MLA(9版)引用形式GOWER, Roger. Speaking Upper - Intermediate. Oxford University Press, 1993.
警告: この引用は必ずしも正確ではありません.