Whitney, N. (1994). Open doors (student's book 1): Có sách. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoWhitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.
Deismireacht MLAWhitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.
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