Library of Congress. Copyright Office. U.S. Copyright Renewals, 1967 January - June.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLibrary of Congress. Copyright Office. U.S. Copyright Renewals, 1967 January - June.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLibrary of Congress. Copyright Office. U.S. Copyright Renewals, 1967 January - June.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.