Cita APA (7th ed.)

Library of Congress & Subjet Cataloging Division. (1999). Library of Congress Subject Headings (23rd. ed.). The National Bibliographic Service.

Cita Chicago (17th ed.)

Library of Congress i Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. Washington: The National Bibliographic Service, 1999.

Cita MLA (9th ed.)

Library of Congress i Subjet Cataloging Division. Library of Congress Subject Headings. 23rd. ed. The National Bibliographic Service, 1999.