Cita APA (7a ed.)

O'Dell, F., & Broadhead, A. (2015). Objective advanced: Student's book with answers (Fourth edition.). Cambridge.

Cita Chicago Style (17a ed.)

O'Dell, Felicity, y Annie Broadhead. Objective Advanced: Student's Book with Answers. Fourth edition. Cambridge: Cambridge, 2015.

Cita MLA (9a ed.)

O'Dell, Felicity, y Annie Broadhead. Objective Advanced: Student's Book with Answers. Fourth edition. Cambridge, 2015.