# Carl Heyder
**Wikidata**: [Q94873098](https://www.wikidata.org/wiki/Q94873098)  
**Source**: https://4ort.xyz/entity/carl-heyder-q94873098


## References

1. Integrated Authority File
2. Catalog of the German National Library
3. CERL Thesaurus
4. NUKAT
5. Virtual International Authority File