# Sergej Hessen

> Polish educationist (1887–1950)

**Wikidata**: [Q4137669](https://www.wikidata.org/wiki/Q4137669)  
**Source**: https://4ort.xyz/entity/sergej-hessen


## References

1. Czech National Authority Database
2. Virtual International Authority File
3. Pedagogues and Psychologists of the World
4. CONOR.SI
5. Treccani's Enciclopedia on line
6. LIBRIS. 2012
7. Sejm-Wielki.pl
8. National Library of Israel Names and Subjects Authority File
9. Bibliography of the History of the Czech Lands