Library of Congress, Library of Congress. Subject Cataloging Division, Library of Congress. Office for Subject Cataloging Policy, Library of Congress. Cataloging Policy and Support Office, & Library of Congress. Policy and Standards Division. (1998). Library of Congress subject headings (21st. ed.). Library of Congress.
Citazione stile Chigago Style (17a edizione)Library of Congress, Library of Congress. Subject Cataloging Division, Library of Congress. Office for Subject Cataloging Policy, Library of Congress. Cataloging Policy and Support Office, e Library of Congress. Policy and Standards Division. Library of Congress Subject Headings. 21st. ed. Washington: Library of Congress, 1998.
Citatione MLA (9a ed.)Library of Congress, et al. Library of Congress Subject Headings. 21st. ed. Library of Congress, 1998.