@book{271,
	author = {Hubbard, R. Glenn. and O'Brien, Anthony Patrick.},
	title = {Essentials of economics /},
	publisher = {Pearson Prentice Hall,},
	year = {c2007.},
	address = {Upper Saddle River, N.J. :},
	url = {http://www.loc.gov/catdir/toc/ecip0615/2006019451.html}
}