@book{21138,
	author = {Lorenzo, Anselmo,},
	title = {Evolución proletaria :},
	publisher = {Publicaciones de la Escuela Moderna :},
	year = {[193-?]},
	address = {Barcelona :},
	edition = {3a ed.},
	url = {http://books.google.com/books?vid=BNC:1001907634&printsec=frontcover}
}