@book{1988,
	author = {Greene, Robert and Elffers, Joost},
	title = {Las 48 leyes del poder / },
	publisher = {Espasa Calpe,},
	year = {2017},
	address = {Madrid :},
	edition = {15ª. edición },
	url = {http://www.consejeriaempresarial.com/publicaciones/48%20leyes%20del%20Poder.pdf}
}