USMARC format for authority data :
including guidelines for content designation /
prepared by Network Development and MARC Standards Office.

APA Citation

Library of Congress. Network Development and MARC Standards Office. (1987). USMARC format for authority data: including guidelines for content designation. Washington: Cataloging Distribution Service, Library of Congress.

MLA Citation

Library of Congress. Network Development and MARC Standards Office. USMARC Format for Authority Data: Including Guidelines for Content Designation. Washington: Cataloging Distribution Service, Library of Congress, 1987.

Warning: These citations may not always be complete (especially for serials).