Cita APA (7th ed.)

Tilbury, A., Clementson, T., Hendra, L. A., & Rea, D. (2010). English unlimited: Pre-intermediate. Coursebook with e-Portfolio. B1. Cambridge University Press.

Cita Chicago (17th ed.)

Tilbury, Alex, Theresa Clementson, Leslie Anne Hendra, i David Rea. English Unlimited: Pre-intermediate. Coursebook with E-Portfolio. B1. Cambridge, United Kingdom: Cambridge University Press, 2010.

Cita MLA (9th ed.)

Tilbury, Alex, et al. English Unlimited: Pre-intermediate. Coursebook with E-Portfolio. B1. Cambridge University Press, 2010.