@book{90668,
	author = {Porter, Michael E.},
	title = {Ventaja competitiva :},
	publisher = {Compañía Editorial Continental,},
	year = {1987},
	address = {México, D.F. :},
	edition = {ed. rev.},
	note = {Trad. de : Competitive advantaje : creating and sustaining superior performance}
}