@book{225590,
	author = {Rodríguez Esquerdo, Pedro J. and Quintero, Ana Helvia.},
	title = {Estadística descriptiva :},
	publisher = {Publicaciones Puertorriqueñas ,},
	year = {1997,reimp. 2010.},
	address = {Hato Rey, P.R. :}
}