Whitney, N. (1994). Open doors (student's book 1): Có sách. Oxford: Oxford University Press.
シカゴスタイル引用形Whitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.
MLA引用形式Whitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.
警告: この引用は必ずしも正確ではありません.