# Otto Haggenmacher
**Wikidata**: [Q55851179](https://www.wikidata.org/wiki/Q55851179)  
**Source**: https://4ort.xyz/entity/otto-haggenmacher


## References

1. Integrated Authority File
2. Catalog of the German National Library
3. Deutsche Biographie
4. International Music Score Library Project
5. The LiederNet Archive
6. MAK