@book{31897,
	author = {Welch, Patrick J. and Welch, Gerry F.},
	title = {Economics, theory and practice /},
	publisher = {Wiley,},
	year = {c2010.},
	address = {Hoboken, NJ :},
	edition = {9th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0814/2006284809-b.html}
}