@book{97739,
	author = {Vázquez Cruz, Ruperto},
	title = {Estadística elemental},
	publisher = {Editorial Universitaria},
	year = {1978, [c1974]},
	address = {Río Piedras, P.R.},
	edition = {6. ed.},
	note = {Publicaciones de la Facultad de Administración Comercial.}
}