Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
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