# Ryszard Grzesik

> Polish medievalist

**Wikidata**: [Q24431080](https://www.wikidata.org/wiki/Q24431080)  
**Source**: https://4ort.xyz/entity/ryszard-grzesik


## References

1. Czech National Authority Database
2. Polish Science
3. [Source](https://nauka-polska.pl/#/profile/research?id=71417)
4. Catalog of the German National Library
5. Virtual International Authority File
6. CiNii Research
7. CONOR.BG
8. MAK
9. Bibliography of the History of the Czech Lands