Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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

Atenció: Aquestes cites poden no estar 100% correctes.