000 00377nam a2200133Ia 4500
008 221001s1980 xx 000 0 eng d
020 _a0029253608
082 _a658 POR
100 _aPorter, Michael E.
245 0 _aCompetitive strategy: Techniques for analyzing industries and competitors
260 _aNew York
_bFree Press
_c1980
300 _axx, 396p.
942 _2ddc
_cBK
999 _c22238
_d22238