@book{70485,
	author = {Langlois, Charles Victor, and Seignobos, Charles,},
	title = {Introduction to the study of history},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-08-08},
	url = {https://www.gutenberg.org/ebooks/29637}
}