APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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