@book{170720,
	author = {Walpole, Ronald E. and Cruz, Ricardo, tr.},
	title = {Probabilidad y estadística para ingenieros  /},
	publisher = { Prentice-Hall,},
	year = {1999},
	address = {México  :},
	edition = {6a ed.},
	note = {Título original: Probability and statistics for engineers and scientists}
}