# Otto Sonnenfeld
**Wikidata**: [Q109877683](https://www.wikidata.org/wiki/Q109877683)  
**Source**: https://4ort.xyz/entity/otto-sonnenfeld


## References

1. Czech National Authority Database
2. Integrated Authority File
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
4. Database of members of the Czechoslovak Republic of military units abroad for the World War II
5. filmportal.de
6. Encyclopedia of Brno History