# Johann Konrad Gretsch
**Wikidata**: [Q55905535](https://www.wikidata.org/wiki/Q55905535)  
**Source**: https://4ort.xyz/entity/johann-konrad-gretsch


## References

1. CERL Thesaurus
2. Catalog of the German National Library
3. International Music Score Library Project
4. [Source](http://thesaurus.cerl.org/record/cnp00605430)