# Carl Sieber
**Wikidata**: [Q94804385](https://www.wikidata.org/wiki/Q94804385)  
**Source**: https://4ort.xyz/entity/carl-sieber


## References

1. BnF authorities
2. Catalog of the German National Library
3. Virtual International Authority File
4. Deutsche Biographie
5. Catalogue of the Library of the Pontifical University of Saint Thomas Aquinas
6. NUKAT
7. MAK