# Karl Hoyer
**Wikidata**: [Q94887170](https://www.wikidata.org/wiki/Q94887170)  
**Source**: https://4ort.xyz/entity/karl-hoyer-q94887170


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. CiNii Research
4. [Source](https://kalliope-verbund.info/DE-611-BF-103817)