Library of Congress. Copyright Office. U.S. Copyright Renewals, 1973 July - December.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLibrary of Congress. Copyright Office. U.S. Copyright Renewals, 1973 July - December.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLibrary of Congress. Copyright Office. U.S. Copyright Renewals, 1973 July - December.
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