Citazione Stile APA (7a Edizione)

Oï Dell, F., & Broadhead, A. (2008). Objective CAE: Workbook with answers (2a. ed.). Cambridge University.

Citazione stile Chigago Style (17a edizione)

Oï Dell, Felicity, e Annie Broadhead. Objective CAE: Workbook with Answers. 2a. ed. Cambridge: Cambridge University, 2008.

Citatione MLA (9a ed.)

Oï Dell, Felicity, e Annie Broadhead. Objective CAE: Workbook with Answers. 2a. ed. Cambridge University, 2008.