@book{3237,
	author = {Welch, Patrick J. and Welch, Gerry F.},
	title = {Economics: theory & practice.  /},
	publisher = {John Wiley,},
	year = {c2010.},
	address = {Hoboken, N.J. :},
	edition = {9th ed. /},
	note = {Previous ed.: 2006.}
}