# Karel Hendrik Eduard de Jong
**Wikidata**: [Q21553227](https://www.wikidata.org/wiki/Q21553227)  
**Source**: https://4ort.xyz/entity/karel-hendrik-eduard-de-jong


## References

1. Catalog of the German National Library
2. Virtual International Authority File
3. Biografisch Portaal
4. Digital Library for Dutch Literature
5. Project Gutenberg
6. Catalogue of the Unione Romana Biblioteche Scientifiche