# MARC 21

> protocol for encoding machine-readable bibliographic records

**Wikidata**: [Q3919686](https://www.wikidata.org/wiki/Q3919686)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/MARC_21)  
**Source**: https://4ort.xyz/entity/marc-21


## References

1. [MARC STANDARDS (Network Development and MARC Standards Office, Library of Congress)](http://www.loc.gov/marc/marc.html)
2. FactGrid
3. [Source](https://github.com/napengam/marc21)