Cita APA (7a ed.)

Library of Congress. (1973). Library of congress classification (6a ed.). Library Of Congress.

Cita Chicago Style (17a ed.)

Library of Congress. Library of Congress Classification. 6a ed. Washington: Library Of Congress, 1973.

Cita MLA (9a ed.)

Library of Congress. Library of Congress Classification. 6a ed. Library Of Congress, 1973.