@book{95729,
	author = {Herschel, John F. W.},
	title = {Preliminary Discourse on the Study of Natural Philosophy},
	publisher = {Project Gutenberg,},
	year = {2017},
	address = {Salt Lake City, UT :},
	note = {Release date is 2017-06-12},
	url = {https://www.gutenberg.org/ebooks/54897}
}