# Johann Ulrich Haffner
**Wikidata**: [Q55842837](https://www.wikidata.org/wiki/Q55842837)  
**Source**: https://4ort.xyz/entity/johann-ulrich-haffner


## References

1. Integrated Authority File
2. IdRef
3. Deutsche Biographie
4. Faceted Application of Subject Terminology
5. Répertoire International des Sources Musicales