@book{252,
	author = {Arnold, Roger A.},
	title = {Economics /},
	publisher = {Thomson/South-Western,},
	year = {c2004.},
	address = {Mason, Ohio :},
	edition = {6th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1104/2002115318-b.html}
}