@book{57837,
	author = {Conant, Levi L.},
	title = {The Number Concept: Its Origin and Development},
	publisher = {Project Gutenberg,},
	year = {2005},
	address = {Salt Lake City, UT :},
	note = {Release date is 2005-08-05},
	url = {https://www.gutenberg.org/ebooks/16449}
}