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This book gets Tommi's two thumbs up for any small or one man business owner. I highly recommend. The Entrepreneur's Trap: How to Stop Working Too Much, Take Back Your Time and Enjoy Life.
A classic in self-improvement, 7 Habits has one of the finest chapters on time management called First Things First. The Big Rocks first lesson and Communication Matrix led to my implementation of Perfect Greeting, Time Blocking, 1st & 10 Strategy, and Hour of Power Strategy in (7L).