Cita APA (7th ed.)

Oï Dell, F., & Broadhead, A. (2008). Objective advanced: Student's book with answers (2a. ed.). Cambridge University Press.

Cita Chicago (17th ed.)

Oï Dell, Felicity, i Annie Broadhead. Objective Advanced: Student's Book with Answers. 2a. ed. Cambridge: Cambridge University Press, 2008.

Cita MLA (9th ed.)

Oï Dell, Felicity, i Annie Broadhead. Objective Advanced: Student's Book with Answers. 2a. ed. Cambridge University Press, 2008.