@book{28705,
	author = {Ritchey, Ferris J.},
	title = {Estadística para las ciencias sociales :},
	publisher = {McGraw-Hill,},
	year = {2002.},
	address = {México :},
	edition = {1a ed.},
	note = {Trad. de Edgar Rubén Cosío Martínez.}
}