@book{139046,
	author = {Peale, Norman Vincent},
	title = {El optimista tenaz /},
	publisher = {Ediciones Grijalbo ,},
	year = {1981.},
	series = {Obras completas de Norman Vincent Peale},
	address = {Barcelona :},
	edition = {9a ed.},
	note = {Translation of :The tough-minded optimist.}
}