@book{80769,
	author = {Espinosa, Ramón J.},
	title = {El proletario en España y el Negro en Cuba},
	publisher = {Project Gutenberg,},
	year = {2012},
	address = {Salt Lake City, UT :},
	note = {Release date is 2012-06-06},
	url = {https://www.gutenberg.org/ebooks/39930}
}