# Johann Josef Alef
**Wikidata**: [Q94761630](https://www.wikidata.org/wiki/Q94761630)  
**Source**: https://4ort.xyz/entity/johann-josef-alef


## References

1. BnF authorities
2. Czech National Authority Database
3. Catalog of the German National Library
4. CERL Thesaurus
5. Répertoire International des Sources Musicales