Library of Congress & Subjet Cataloging Division. (2000). Library of Congress Subject Headings (23rd. ed.). The National Bibliographic Service.

Library of Congress and Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. Washington: The National Bibliographic Service, 2000.

Library of Congress and Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. The National Bibliographic Service, 2000.