Oï Dell, F., & Broadhead, A. (2008). Objective advanced: Student's book with answers (2a. ed.). Cambridge University Press.
Citace podle Chicago (17th ed.)Oï Dell, Felicity, a Annie Broadhead. Objective Advanced: Student's Book with Answers. 2a. ed. Cambridge: Cambridge University Press, 2008.
Citace podle MLA (9th ed.)Oï Dell, Felicity, a Annie Broadhead. Objective Advanced: Student's Book with Answers. 2a. ed. Cambridge University Press, 2008.
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