@book{79981,
	author = {Todd, David P.},
	title = {Astronomy: The Science of the Heavenly Bodies},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-03-15},
	url = {https://www.gutenberg.org/ebooks/39142}
}