@book{48191,
	author = {Frondizi, Risieri},
	title = {¿Qué son los valores?},
	publisher = {Fondo de Cultura Económica},
	year = {1972},
	series = {Breviarios},
	address = {México D.F.},
	edition = {5a. ed. corr. y aum.}
}