Duckworth, M. (1996). Open doors: Workbook 3. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoDuckworth, Michael. Open Doors: Workbook 3. Oxford: Oxford University Press, 1996.
MLA引文Duckworth, Michael. Open Doors: Workbook 3. Oxford: Oxford University Press, 1996.
警告：这些引文格式不一定是100％准确.