Wittenberg, P. (1968). The protection of literary property. Writer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWittenberg, Philip. The Protection of Literary Property. Boston: Writer, 1968.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWittenberg, Philip. The Protection of Literary Property. Writer, 1968.
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