@book{8227,
	author = {Ruffin, Roy, and Gregory, Paul R.},
	title = {Principles of microeconomics /},
	publisher = {Scott, Foresman,},
	year = {c1983.},
	address = {Glenview, Ill. :},
	note = {Also issued in a combined volume with Principles of macroeconomics, under title: Principles of economics.}
}