000 00303nam a2200133Ia 4500
008 150227s9999 xx 000 0 und d
082 _aPOR
100 _a"Porter,Michael,E"
245 _aCompetitive Advantage
250 _a2006
260 _b"Free Press,New York"
300 _aPOR
938 _bCEN_1001
999 _c1858
_d1858