# Petr Czajkowski
**Wikidata**: [Q95169594](https://www.wikidata.org/wiki/Q95169594)  
**Source**: https://4ort.xyz/entity/petr-czajkowski


## References

1. Czech National Authority Database
2. Personal Authority Wikibase of the Czech Republic
3. Virtual International Authority File
4. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
5. Bibliography of the History of the Czech Lands