# Frank Hadler
**Wikidata**: [Q95222686](https://www.wikidata.org/wiki/Q95222686)  
**Source**: https://4ort.xyz/entity/frank-hadler


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. Virtual International Authority File
4. CiNii Research
5. Bibliography of the History of the Czech Lands