@book{30695,
	author = {Kelsen, Hans. and Vernengo, Roberto José,},
	title = {Teoria pura del derecho /},
	publisher = {Editorial Porrua,},
	year = {1995.},
	series = {Titulo original. Reine rechtslehre},
	address = {Mexico :},
	edition = {8a ed.}
}