000 00309nam a2200109Ia 4500
008 190830s9999 xx 000 0 und d
082 _a658 POR
100 _aMichael E Porter
245 0 _aCompetitive Advantage :Creating and Sustaining Superior Performance
260 _bSimon & Schuster
_c2004
942 _cBOOK
999 _c55103
_d55103