@book{67317,
	author = {Coolidge, Julian Lowell,},
	title = {The Elements of non-Euclidean Geometry},
	publisher = {Project Gutenberg,},
	year = {2008},
	address = {Salt Lake City, UT :},
	note = {Release date is 2008-08-20},
	url = {https://www.gutenberg.org/ebooks/26373}
}