# Jan Pietrzykowski
**Wikidata**: [Q11718681](https://www.wikidata.org/wiki/Q11718681)  
**Source**: https://4ort.xyz/entity/jan-pietrzykowski


## References

1. Czech National Authority Database
2. [Source](https://czestochowa.grobonet.com/grobonet/start.php?id=detale&idg=3206)
3. [Source](http://viaf.org/viaf/data/viaf-20170101-links.txt.gz)
4. Virtual International Authority File
5. [Source](https://encyklopedia.czestochowa.pl/hasla/pietrzykowski-jan)
6. National Library of Israel Names and Subjects Authority File