@book{91889,
	author = {Quintero Rivera, Ángel Guillermo,},
	title = {Lucha obrera},
	publisher = {C[entro] de E[studios de la] R[ealidad] P[uertorriqueña},
	year = {1970]},
	address = {[s.l.]},
	note = {Cover title: Lucha obrera en Puerto Rico.}
}