The 7 Habits of Highly Effective People One of the best books I have found to help you to be personally effective
Getting Things Done: The Art of Stress-free Productivity A great system for dealing with everyday situations effectively
4 Disciplines of Execution: Getting Strategy Done An extremely effective system of reaching your goals as an organisation
Five Wealth Secrets 96% of Us Don't Know The best book I have ever read on getting your personal finance in order