APA (7th ed.) Zitazioa

Library of Congress & Subjet Cataloging Division. (1998). Subject Headings (21th. ed.). The National Bibliographic Service.

Chicago Style (17th ed.) Zitazioa

Library of Congress eta Subjet Cataloging Division. Subject Headings. 21th. ed. Washington: The National Bibliographic Service, 1998.

MLA (9th ed.) Zitazioa

Library of Congress eta Subjet Cataloging Division. Subject Headings. 21th. ed. The National Bibliographic Service, 1998.