# Bartholomäus Helder
**Wikidata**: [Q28525785](https://www.wikidata.org/wiki/Q28525785)  
**Source**: https://4ort.xyz/entity/bartholom-us-helder


## References

1. Deutsche Biographie
2. [BnF authorities](https://catalogue.bnf.fr/ark:/12148/cb13895103b)
3. Musicalics
4. general catalog of BnF
5. Virtual International Authority File
6. Biography & Genealogy Master Index
7. BnF authorities