# Karl von Martens
**Wikidata**: [Q5977632](https://www.wikidata.org/wiki/Q5977632)  
**Source**: https://4ort.xyz/entity/karl-von-martens


## References

1. Integrated Authority File
2. BnF authorities
3. [Source](https://kanselarijmuseum.nl/UserFiles/File/erepenningen%20bijlagen%20DEF.pdf)
4. general catalog of BnF
5. Virtual International Authority File
6. Catalogo of the National Library of India