# Otto Kälin
**Wikidata**: [Q85098716](https://www.wikidata.org/wiki/Q85098716)  
**Source**: https://4ort.xyz/entity/otto-k-lin


## References

1. Integrated Authority File
2. Aargauer Bibliografie
3. Catalog of the German National Library
4. SIKART
5. [Source](https://www.portraitarchiv.ch/portrait/show/290963)