# Ondrej Richard Halaga

> Slovak historian

**Wikidata**: [Q13537869](https://www.wikidata.org/wiki/Q13537869)  
**Source**: https://4ort.xyz/entity/ondrej-richard-halaga


## References

1. BnF authorities
2. Czech National Authority Database
3. general catalog of BnF
4. Virtual International Authority File
5. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
6. Bibliography of the History of the Czech Lands