# Friedrich Ernst Kettner
**Wikidata**: [Q1459007](https://www.wikidata.org/wiki/Q1459007)  
**Source**: https://4ort.xyz/entity/friedrich-ernst-kettner


## References

1. Integrated Authority File
2. Czech National Authority Database
3. Virtual International Authority File
4. BnF authorities
5. CERL Thesaurus
6. LIBRIS. 2012
7. FactGrid