000			00349cam a2200133ua 4500
020			_a978-1-4221-6059-6
082			_a658.4012 _bMAG-U
100			_aMagretta, Joan.
245			_aUnderstanding Michael Porter :
260			_aMassachusetts: _bHarvard Business Review Press. _c2012.
300			_a236p.
650			_aStrategic management
942			_cBK
999			_c50014 _d50014