Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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