MARC 21 is the product of the integration of USMARC, UKMARC and CANMARC (Canadian MARC). It is the most extensively used MARC format in the world and a de facto standard. It has been designed to be both a production format and an exchange format. There are five MARC 21 formats: 

  • Bibliographic
  • Authorities
  • Holdings
  • Classification
  • Community information

The current maintenance agency for MARC 21 is the Library of Congress which offers support documents on the formats with several translations including: Understanding MARC Bibliographic, Library of Congress and Understanding MARC Authority Records. The French translations of the MARC 21 formats are maintained by Library and Archives Canada.

Bibliographies, Bibliography, Best practices

Last update: 5 December 2017

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