# Hendrik Leendert Heijkoop
**Wikidata**: [Q56148682](https://www.wikidata.org/wiki/Q56148682)  
**Source**: https://4ort.xyz/entity/hendrik-leendert-heijkoop


## References

1. Integrated Authority File
2. BnF authorities
3. Catalog of the German National Library
4. Virtual International Authority File