@book{70849,
	author = {Price, Derek J. de Solla},
	title = {On the Origin of Clockwork, Perpetual Motion Devices, and the Compass},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-09-16},
	url = {https://www.gutenberg.org/ebooks/30001}
}