# Wilhelm Haefs
**Wikidata**: [Q93237712](https://www.wikidata.org/wiki/Q93237712)  
**Source**: https://4ort.xyz/entity/wilhelm-haefs


## References

1. BnF authorities
2. Catalog of the German National Library
3. Virtual International Authority File
4. Library of Congress Authorities
5. Bibliography of the History of the Czech Lands