Cita APA (7th ed.)

Oï Dell, F., & Broadhead, A. (2008). Objective.CAE: Self-study student's book (2a. ed.). Cambridge University.

Cita Chicago (17th ed.)

Oï Dell, Felicity, i Annie Broadhead. Objective.CAE: Self-study Student's Book. 2a. ed. Cambridge: Cambridge University, 2008.

Cita MLA (9th ed.)

Oï Dell, Felicity, i Annie Broadhead. Objective.CAE: Self-study Student's Book. 2a. ed. Cambridge University, 2008.