Cita APA (7th ed.)

Tilbury, A., Hendra, L. A., Rea, D., & Clementson, T. (2011). English unlimited: Upper Intermediate. Coursebook with e-Portfolio. B2. Cambridge University Press.

Cita Chicago (17th ed.)

Tilbury, Alex, Leslie Anne Hendra, David Rea, i Theresa Clementson. English Unlimited: Upper Intermediate. Coursebook with E-Portfolio. B2. Cambridge: Cambridge University Press, 2011.

Cita MLA (9th ed.)

Tilbury, Alex, et al. English Unlimited: Upper Intermediate. Coursebook with E-Portfolio. B2. Cambridge University Press, 2011.