Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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