# František Xaver Leffler
**Wikidata**: [Q94929689](https://www.wikidata.org/wiki/Q94929689)  
**Source**: https://4ort.xyz/entity/franti-ek-xaver-leffler


## References

1. Catalog of the German National Library
2. Czech National Authority Database
3. Virtual International Authority File
4. Bibliography of the History of the Czech Lands