@book{19417,
	author = {Hume, David and Duque, Felix.},
	title = {Tratado de la naturaleza  Félix Duque Félix Duque},
	publisher = {Nacional},
	year = {1981},
	series = {Biblioteca de la literatura y el pensamiento universales, No. 2},
	address = {Madrid (España)},
	edition = {2a. ed.}
}