@book{91804,
	author = {Schopenhauer, Arthur, and Hillebrand, Karl, Mme.},
	title = {On the Fourfold Root of the Principle of Sufficient Reason, and On the Will in Nature: Two Essays (revised edition)},
	publisher = {Project Gutenberg,},
	year = {2016},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/On_the_Fourfold_Root_of_the_Principle_of_Sufficient_Reason},
	url = {https://www.gutenberg.org/ebooks/50966}
}