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(1)Competitive Advantage, creating and sustain superior performance. Micheal E.Porter copyright 1985 by Micheal E. Porter Pg4559


(2)Information Technology strategic for business, Edited by Jeo Peppard, Cranfield, Cranfield school management. First published in Great Britain 1993 Pg5964


(3)Information system a management perspective second Edition, steven Alter, University of San Francisco copyright 1996 by the Benjamin/ Cummings Publishing Company, Inc.Pg2021