Competitive Advantage, Creating and Sustaining Superior Performance (Hardcover)
by Michael E. Porter

An awesome classic, a business must-read from one of the world's leading authorities on competitive strategy and international competitiveness.

Competitive Strategy, Techniques for Analyzing Industries and Competitors, with a New Introduction (Hardcover)
by Michael E. Porter

Written more than 20 years ago, Porter's masterpiece is the most important work on competitive strategy to date.