@book{29119,
	author = {Uparella, Jairo. and Uparella, Jairo.},
	title = {Historia y evolucion de la pc :},
	publisher = {S.Y E del caribe,,},
	year = {1996.},
	address = {Cartagena de Indias : :},
	note = {Incluye apendice.}
}