Cita APA

Duckworth, M. (1996). Open doors: Workbook 3. Oxford: Oxford University Press.

Chicago Style Citation

Duckworth, Michael. Open Doors: Workbook 3. Oxford: Oxford University Press, 1996.

Cita MLA

Duckworth, Michael. Open Doors: Workbook 3. Oxford: Oxford University Press, 1996.

Atenció: Aquestes cites poden no estar 100% correctes.