# Ernst Harder
**Wikidata**: [Q52155508](https://www.wikidata.org/wiki/Q52155508)  
**Source**: https://4ort.xyz/entity/ernst-harder


## References

1. BnF authorities
2. Catalog of the German National Library
3. Virtual International Authority File
4. CiNii Research
5. CONOR.SI
6. Faceted Application of Subject Terminology
7. VcBA (identifier)
8. NUKAT
9. CONOR.BG
10. CONOR.SR
11. Trove
12. National Library of Israel Names and Subjects Authority File