Porter, Michael E. Competitive strategy : techniques for analyzing industries and competitors / Michael E. Porter. - New York : The Free Press, 1998. - xxviii, 396 pages : black and white illustrations ; 24 cm. Includes glossary, and index. ISBN: 0684841487 Subjects--Topical Terms: Competition.Industrial management. Dewey Class. No.: CIR 658.21 P847 1998