@book{71456,
	author = {Blackmar, Frank W.},
	title = {History of Human Society},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-12-06},
	url = {https://www.gutenberg.org/ebooks/30610}
}