# Theo Keller
**Wikidata**: [Q64589990](https://www.wikidata.org/wiki/Q64589990)  
**Source**: https://4ort.xyz/entity/theo-keller


## References

1. Integrated Authority File
2. 20th Century Press Archives
3. University Archives St. Gallen (HSG)
4. Enciclopédia Itaú Cultural
5. NUKAT
6. Virtual International Authority File