000			00363nam a2200133Ia 4500
100			_aPorter, Michael E
020			_a0-684-84146-0
654			_aCommerce and Management
942			_cBK
245			_aCompetitive advantage : creating and sustaining superior performance
260			_aThe Free Press, New York _c1985
082			_a658.1145 Por
300			_axxv,559
999			_c29681 _d29681