APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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