# Friedrich Kettner
**Wikidata**: [Q94811333](https://www.wikidata.org/wiki/Q94811333)  
**Source**: https://4ort.xyz/entity/friedrich-kettner-q94811333


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. [LIBRIS. 2018](https://libris.kb.se/wt7bh30f5rnsd8m)