@book{144107,
	author = {Ruffin, Roy. and Gregory, Paul R.},
	title = {Principles of macroeconomics /},
	publisher = {Scott, Foresman,},
	year = {c1986.},
	address = {Glenview, Ill. :},
	edition = {2nd ed.},
	note = {Also issued in a combined volume with Principles of microeconomics, under title: Principles of economics.}
}