@book{93312,
	author = {Raz, Joseph.},
	title = {The concept of a legal system :},
	publisher = {Oxford University Press,},
	year = {1980.},
	address = {New York :},
	edition = {2d ed.},
	note = {Based on thesis, Oxford University.},
	url = {http://www.columbia.edu/cgi-bin/cul/resolve?clio10296331}
}