Cita APA

Library of Congress & Library of Congress. Policy and Standards Division. Library of Congress classification. Z. Bibliography. Library science. Information resources ([2009 edition].).

Citación estilo Chicago

Library of Congress and Library of Congress. Policy and Standards Division. Library of Congress Classification. Z. Bibliography. Library Science. Information Resources. [2009 edition].

Cita MLA

Library of Congress and Library of Congress. Policy and Standards Division. Library of Congress Classification. Z. Bibliography. Library Science. Information Resources. [2009 edition].