@book{73957,
	author = {Engels, Friedrich, and Untermann, Gerhard Ernest,},
	title = {The origin of the family, private property, and the state},
	publisher = {Project Gutenberg,},
	year = {2010},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/The_Origin_of_the_Family,_Private_Property_and_the_State},
	url = {https://www.gutenberg.org/ebooks/33111}
}