@book{24450,
	author = {Engels, Friedrich, and Bartra, Roger},
	title = {El origen de la familia, la propiedad privada y el Estado / :},
	editor = {Editora Alfa y Omega},
	publisher = {[s. n.] ,},
	year = {1984.},
	series = {Marx-Engels},
	address = {[s. l.] :}
}