# Jan Sommerfeld starszy
**Wikidata**: [Q96747595](https://www.wikidata.org/wiki/Q96747595)  
**Source**: https://4ort.xyz/entity/jan-sommerfeld-starszy


## References

1. Integrated Authority File
2. Sejm-Wielki.pl
3. BnF authorities
4. Virtual International Authority File
5. [Source](https://www.ipsb.nina.gov.pl/a/biografia/jan-sommerfeld-starszy)