# On the Fourfold Root of the Principle of Sufficient Reason

> work by Arthur Schopenhauer

**Wikidata**: [Q1762229](https://www.wikidata.org/wiki/Q1762229)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/On_the_Fourfold_Root_of_the_Principle_of_Sufficient_Reason)  
**Source**: https://4ort.xyz/entity/on-the-fourfold-root-of-the-principle-of-sufficient-reason


## References

1. Freebase Data Dumps. 2013
2. Integrated Authority File