@book{148621,
	author = {Alchourrón, Carlos E. and Bulygin , Eugenio .},
	title = {Introduccion a la metodología de las ciencias jurídicas y sociales},
	publisher = {Editorial Astrea de R. Depalma},
	year = {1993.},
	series = {Coleccion mayor Filosofia y derecho},
	address = {Buenos Aires},
	edition = {2. reimp.},
	note = {Translation of Normative systems.}
}