APA (7th ed.) Citation

Whitney, N., & Macfarlane, M. (1999). Open doors: Secundaria 1 (1st ed., 11th impr.). Oxford University Press.

Chicago Style (17th ed.) Citation

Whitney, Norman, and Michael Macfarlane. Open Doors: Secundaria 1. 1st ed., 11th impr. Oxford: Oxford University Press, 1999.

MLA (9th ed.) Citation

Whitney, Norman, and Michael Macfarlane. Open Doors: Secundaria 1. 1st ed., 11th impr. Oxford University Press, 1999.