# Siegfried Kullen
**Wikidata**: [Q95327555](https://www.wikidata.org/wiki/Q95327555)  
**Source**: https://4ort.xyz/entity/siegfried-kullen


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. Czech National Authority Database
4. Virtual International Authority File
5. CiNii Research
6. [Source](https://de.wikipedia.org/wiki/Siegfried_Kullen#Quellen)