APA (7th ed.) Zitazioa

Doff, A., & Goldstein, B. (2011). English unlimited: Advanced. Coursebook with e-Portfolio. C1. Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

Doff, Adrian, eta Ben Goldstein. English Unlimited: Advanced. Coursebook with E-Portfolio. C1. Cambridge: Cambridge University Press, 2011.

MLA (9th ed.) Zitazioa

Doff, Adrian, eta Ben Goldstein. English Unlimited: Advanced. Coursebook with E-Portfolio. C1. Cambridge University Press, 2011.