@book{12191,
	author = {Samuelson, William F. and Marks , Stephen G.},
	title = {Managerial economics /},
	publisher = {Dryden Press,},
	year = {1992},
	series = {(The Dryden Press Series in Economics)},
	address = {Fort Worth :},
	edition = {third editions.},
	note = {Includes index.}
}