Cita APA

Richards, J. C., Hull, J., & Proctor, S. (1994). Changes: English for international communication : workbook 1. Cambridge :: Cambridge University Press.

Citación estilo Chicago

Richards, Jack C., Jonathan Hull, y Susan Proctor. Changes: English for International Communication : Workbook 1. Cambridge :: Cambridge University Press, 1994.

Cita MLA

Richards, Jack C., Jonathan Hull, y Susan Proctor. Changes: English for International Communication : Workbook 1. Cambridge :: Cambridge University Press, 1994.