@book{8841,
	author = {Johnston, C. L. and Willis, Alden T.},
	title = {Essential algebra /},
	publisher = {Wadsworth Pub. Co.,},
	year = {c1991.},
	series = {The Johnston/Willis developmental mathematics series},
	address = {Belmont, Calif. :},
	edition = {6th ed.},
	note = {Includes index.}
}