# Jan Ptak

> Polish medievalist

**Wikidata**: [Q19691389](https://www.wikidata.org/wiki/Q19691389)  
**Source**: https://4ort.xyz/entity/jan-ptak


## References

1. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
2. Polish Science
3. Library of Congress Authorities
4. [Source](https://nauka-polska.pl/#/profile/scientist?id=12028)
5. Virtual International Authority File