Tilbury, A., Clementson, T., Hendra, L. A., & Rea, D. (2010). English unlimited: Pre-intermediate. Coursebook with e-Portfolio. B1. Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Tilbury, Alex, Theresa Clementson, Leslie Anne Hendra, e David Rea. English Unlimited: Pre-intermediate. Coursebook with E-Portfolio. B1. Cambridge, United Kingdom: Cambridge University Press, 2010.
Citatione MLA (9a ed.)Tilbury, Alex, et al. English Unlimited: Pre-intermediate. Coursebook with E-Portfolio. B1. Cambridge University Press, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.