@book{181719,
	author = {Peale, Norman Vincent},
	title = {El pensamiento tenaz en la actualidad :},
	publisher = {Ediciones Grijalbo ,},
	year = {1978.},
	series = {Obras completas de Norman Vincent Peale},
	address = {Barcelona :},
	note = {Traducción de: The positive principle today.}
}