Classicly

Napoleon read it. As did General MacArthur, Mao Tse-tung, and Tony Soprano. But Sun Tzu's Art of War is more than the most influential and famous book on military strategy: it's also a great everyday read for anyone who wants to outsmart, outmaneuver, and generally crush one's enemies using techniques of speed, stealth and flexibility. This time-tested, two-thousand-year old work is a classic for getting the upper-hand from the battlefield to the boardroom.