Cita APA (7a ed.)

Library of Congress. MARC Development Office. (1974). Information on the MARC system (4th ed.). Library of Congress.

Cita Chicago Style (17a ed.)

Library of Congress. MARC Development Office. Information on the MARC System. 4th ed. Washington: Library of Congress, 1974.

Cita MLA (9a ed.)

Library of Congress. MARC Development Office. Information on the MARC System. 4th ed. Library of Congress, 1974.