7Prepared by Network Development and MARC Standards Ofrice. USMARC format for bibliographic data: including guidelines for content designation. Washington, D.C.: Cataloghtg Distribution Service, Librmy of Congress. 1997.
8Library of Congresses Network Develolmmnt and MARC StandardsOflice, MARC Standarch, 2 Aug 2001 (http://lcweb.loc.gov/marc/).
