@book{28064,
	author = {Spencer, Milton H. and Seo, K. K.,},
	title = {Managerial economics :},
	publisher = {R. D. Irwin,},
	year = {c1975.},
	series = {The Irwin series in economics.},
	address = {Homewood, Ill. :},
	edition = {4th ed.},
	note = {Includes index.}
}