Cita APA

Whitney, N. (1994). Open doors (student's book 1): Có sách. Oxford: Oxford University Press.

Citación estilo Chicago

Whitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.

Cita MLA

Whitney, Norman. Open Doors (student's Book 1): Có Sách. Oxford: Oxford University Press, 1994.