Tilbury, A., Hendra, L. A., Rea, D., & Clementson, T. (2011). English unlimited: Upper Intermediate. Coursebook with e-Portfolio. B2. Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Tilbury, Alex, Leslie Anne Hendra, David Rea, e Theresa Clementson. English Unlimited: Upper Intermediate. Coursebook with E-Portfolio. B2. Cambridge: Cambridge University Press, 2011.
Citatione MLA (9a ed.)Tilbury, Alex, et al. English Unlimited: Upper Intermediate. Coursebook with E-Portfolio. B2. Cambridge University Press, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.