Richards, J. C., Hull, J., & Proctor, S. (1994). Changes: English for international communication : student's book 1. Cambridge: Cambridge University Press.
Stile di citazione ChicagoRichards, Jack C., Jonathan Hull, e Susan Proctor. Changes: English for International Communication : Student's Book 1. Cambridge: Cambridge University Press, 1994.
Citazione MLARichards, Jack C., Jonathan Hull, e Susan Proctor. Changes: English for International Communication : Student's Book 1. Cambridge: Cambridge University Press, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.