Crystal, D. (2003). English as a global language (2nd ed.). Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCrystal, David. English as a Global Language. 2nd ed. New York ; New Delhi: Cambridge University Press, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCrystal, David. English as a Global Language. 2nd ed. Cambridge University Press, 2003.
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