@book{30469,
	author = {Cowen, Tyler. and Tabarrok, Alexander.},
	title = {Modern principles of economics.},
	publisher = {Worth Publishers,},
	year = {c2013.},
	address = {New York, NY :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1502/2011940683-d.html}
}