Library of Congress & Subjet Cataloging Division. (2007). Subject Headings (30th. ed.). The National Bibliographic Service.
Chicago Style (17th ed.) CitationLibrary of Congress and Subjet Cataloging Division. Subject Headings. 30th. ed. Washington: The National Bibliographic Service, 2007.
MLA (9th ed.) CitationLibrary of Congress and Subjet Cataloging Division. Subject Headings. 30th. ed. The National Bibliographic Service, 2007.