000 00282nam a22001097a 4500
999 _c6614
_d6614
082 _a658
_bPOR/COM
100 _aPorter Michael E
245 _aCompetitive Advantage
_bcreating and sustaining superior performance
260 _aNew York
_bFree Press
_c1985
300 _a536p
942 _cBK