Library of Congress & Subjet Cataloging Division. (1999). Library of Congress Subject Headings (23rd. ed.). The National Bibliographic Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLibrary of Congress और Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. Washington: The National Bibliographic Service, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLibrary of Congress और Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. The National Bibliographic Service, 1999.
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