There are more than 5...
1. Start With Why - Simon Sinek
2. 21 Irrefutable Laws of Leadership - John Maxwellj
3. The Little Book of Leadership - Jeffrey Gitomer
4. Tribes - Seth Godin
5. Leadership Land Mines - John Maxwell
5.5 Execution - the discipline of getting things done - Larry Bossidy and Ram Charan
The number one business book to work through is "Seven Habits of Highly Effective People" by Stephen Covey...It is so basic. Read it over 6-7 months...doing the exercises at the end of each chapter. And if you read it in the past, re-read it. The book is all about how to lead a balanced and successful life.