Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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