Cita APA (7a ed.)

Whitney, N., & Ward, A. (1997). Open doors: Secundaria 2 (1st ed., 6th impr.). Oxford University Press.

Cita Chicago Style (17a ed.)

Whitney, Norman, y Ann Ward. Open Doors: Secundaria 2. 1st ed., 6th impr. Oxford: Oxford University Press, 1997.

Cita MLA (9a ed.)

Whitney, Norman, y Ann Ward. Open Doors: Secundaria 2. 1st ed., 6th impr. Oxford University Press, 1997.