# Johannes Hassenstein
**Wikidata**: [Q124181011](https://www.wikidata.org/wiki/Q124181011)  
**Source**: https://4ort.xyz/entity/johannes-hassenstein


## References

1. Catalog of the German National Library
2. NUKAT
3. MAK
4. [Source](http://encyklopedia.warmia.mazury.pl/index.php/Johannes_Hassenstein)