@book{132023,
	author = {Alchourrón, Carlos E., and Bulygin, Eugenio,},
	title = {Introducción a la metodología de las ciencias jurídicas y sociales },
	publisher = {Astrea,},
	year = {2002},
	series = {mayor},
	address = {Buenos Aires :},
	edition = {1a ed.}
}