Whitney, N. (1995). Open doors: Student's book 3. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoWhitney, Norman. Open Doors: Student's Book 3. Oxford: Oxford University Press, 1995.
MLA引文Whitney, Norman. Open Doors: Student's Book 3. Oxford: Oxford University Press, 1995.
警告：這些引文格式不一定是100％准確.