@book{1499,
	author = {Scheaffer, Richard L. and Lyman Ott, R.},
	title = {Elementos de muestreo.},
	publisher = {Grupo Editor Iberoamérica, },
	year = {1987.},
	address = {México : },
	edition = {1ra.ed.},
	note = {Bibliografía: p.303. }
}