Richards, J. C., Hull, J., & Proctor, S. (1996). Changes: English for international communication. Cambridge: Cambridge University Press.
استشهاد بنمط شيكاغوRichards, Jack C., Jonathan Hull, و Susan Proctor. Changes: English for International Communication. Cambridge: Cambridge University Press, 1996.
MLA استشهادRichards, Jack C., Jonathan Hull, و Susan Proctor. Changes: English for International Communication. Cambridge: Cambridge University Press, 1996.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.