@book{40592,
	author = {Ranval, Pierre. and Pérez, Alejandro,},
	title = {Jerarquía de salarios y lucha de clases /},
	publisher = {Grijalbo,},
	year = {1975 .},
	address = {Barcelona :},
	note = {Tít. orig. : Heérarchie des salaires et lutte des classes.}
}