@book{1489,
	author = {Boullon, Roberto C.},
	title = {Las actividades turisticas y recreacionales :},
	publisher = {Trillas,},
	year = {1990.},
	series = {Serie trillas turismo},
	address = {Mexico :},
	edition = {3a. ed.},
	note = {Incluye indice.}
}