# Josef Ptáček
**Wikidata**: [Q105729327](https://www.wikidata.org/wiki/Q105729327)  
**Source**: https://4ort.xyz/entity/josef-pt-ek-q105729327


## References

1. [Source](https://www.kapitulakarlstejn.cz/kanovnici.html)
2. Czech National Authority Database
3. Virtual International Authority File
4. [Source](http://www3.mkcr.cz/cns_internet/CNS/detail_cpo.aspx?id_subj=2068)
5. Register of registered legal entities maintained by the Ministry of Culture