@book{57993,
	author = {Alder, Henry L. and Roessler, Edward B.},
	title = {Introduction to probability and statistics},
	publisher = {Freeman,},
	year = {1972},
	address = {San Francisco, Calif. :},
	edition = {5 ed.},
	note = {Sustituye c.7 de la 4 ed.}
}