APA (7th ed.) Zitazioa

United States. Library of Congress. Library of Congress subject heading. [s.n.].

Chicago Style (17th ed.) Zitazioa

United States. Library of Congress. Library of Congress Subject Heading. [s.l: [s.n.].

MLA (9th ed.) Zitazioa

United States. Library of Congress. Library of Congress Subject Heading. [s.n.].

Kontuz: berrikusi erreferentzia hauek erabili aurretik.