APA-Zitierstil (7. Ausg.)

Whitney, N. (1998). Open doors: Student's book + workbook. Oxford University Press.

Chicago-Zitierstil (17. Ausg.)

Whitney, Norman. Open Doors: Student's Book + Workbook. New York: Oxford University Press, 1998.

MLA-Zitierstil (9. Ausg.)

Whitney, Norman. Open Doors: Student's Book + Workbook. Oxford University Press, 1998.