@book{68292,
	author = {Raz, Joseph.},
	title = {The concept of a legal system :},
	publisher = {Clarendon Press ;},
	year = {1980.},
	address = {Oxford :},
	edition = {2nd ed.},
	note = {Based on thesis, Oxford University.},
	url = {http://www.loc.gov/catdir/enhancements/fy0605/80040190-d.html}
}