Aguirre Horno, H. «The Feminism of Engels in The Origin of the Family, Private Property and the Stat»e. Filosofia, Ara! Revista Per a Pensar, Vol. 4, núm. 1, Aug. 2018, p. 21-22, http://www.infofilosofia.info/revista-prova/index.php/FA/article/view/Feminism-Engels.