TY - BOOK T1 - Competitive advantage creating and sustaining superior performance A1 - Porter, Michael E. 1947- LA - English PP - New York PB - Free Press YR - 1985 UL - https://tuklas.up.edu.ph/Record/UP-99796217607013252 OP - 557 CN - HD 41 P66 KW - Competition. KW - Industrial management. ER -