Porter, Michael E. Competitive strategy : techniques for analyzing industries and competitors: with a new introduction / Michael E. Porter. - New York : The Free Press, 1998. - xxviii, 396 p. ISBN: 0684841487 (hbk) : 0743260880 (pbk) Subjects--Topical Terms: Competition.Industrial management. LC Class. No.: HD41 / .P67 1998