Cita APA (7a ed.)

O'Dell, F., & Broadhead, A. (2006). Objective: CAE. Cambridge University Press.

Cita Chicago Style (17a ed.)

O'Dell, Felicity, y Annie Broadhead. Objective: CAE. Cambridge: Cambridge University Press, 2006.

Cita MLA (8a ed.)

O'Dell, Felicity, y Annie Broadhead. Objective: CAE. Cambridge University Press, 2006.