# Siegfried Schmitz
**Wikidata**: [Q61198423](https://www.wikidata.org/wiki/Q61198423)  
**Source**: https://4ort.xyz/entity/siegfried-schmitz


## References

1. Czech National Authority Database
2. [REGO](https://aleph.vkol.cz/F/?func=find-c&ccl_term=sys=000013178&local_base=svk04)
3. Catalog of the German National Library
4. [Source](https://www.biographien.ac.at/oebl/oebl_S/Schmitz_Siegfried_1886_1941.xml)
5. NUKAT
6. National Library of Portugal
7. MAK
8. Library of Congress Control Number