Downs, R. B. (1978). Books that changed the world (2nd ed.). American Library Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDowns, Robert Bingham. Books That Changed the World. 2nd ed. Chicago: American Library Association, 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDowns, Robert Bingham. Books That Changed the World. 2nd ed. American Library Association, 1978.
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