Cita APA (7a ed.)

Macfarlane, M., & Whitney, N. (1997). Open doors: Workbook. Oxford University Press.

Cita Chicago Style (17a ed.)

Macfarlane, Mike, y Norman Whitney. Open Doors: Workbook. New York, EUA: Oxford University Press, 1997.

Cita MLA (9a ed.)

Macfarlane, Mike, y Norman Whitney. Open Doors: Workbook. Oxford University Press, 1997.