Cita APA

Library of Congress. (1967). Classification (6a. ed.). Washington D.C.: The Library of Congress. Processing Department. Subject Cataloging Division.

Citación estilo Chicago

Library of Congress. Classification. 6a. ed. Washington D.C.: The Library of Congress. Processing Department. Subject Cataloging Division, 1967.

Cita MLA

Library of Congress. Classification. 6a. ed. Washington D.C.: The Library of Congress. Processing Department. Subject Cataloging Division, 1967.