@book{149115,
	author = {Sweezy, Paul M. and Bettelheim, Charles.},
	title = {Algunos problemas actuales del socialismo / },
	editor = {Closas-Orcoyen)},
	publisher = {Siglo Veintiuno, },
	year = {[1976] (},
	address = {[Madrid] : },
	edition = {[4ª ed.].}
}