@book{45220,
	author = {Lipsey, Richard G.,},
	title = {An introduction to positive economics /},
	publisher = {Weidenfeld and Nicolson,},
	year = {1971 [Reprinted 1972]},
	address = {London :},
	edition = {3rd E. L. B. S. ed.},
	note = {Includes index.}
}