# Josef Friedrich Zwettler
**Wikidata**: [Q51566678](https://www.wikidata.org/wiki/Q51566678)  
**Source**: https://4ort.xyz/entity/josef-friedrich-zwettler


## References

1. Czech National Authority Database
2. [The Fine Art Archive](https://cs.isabart.org/person/55473)
3. [Web umenia](https://www.webumenia.sk/autor/12198)
4. [List of residents in Prague 1830-1910 (1920)](http://amp.bach.cz/pragapublica/permalink?xid=B23C70B7EE4111E4B6BB40618600A675&scan=1)
5. Web umenia
6. Répertoire International des Sources Musicales