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The best business books need no introduction, some are all time classics and some are modern masterpieces. In any case they are sure to help make you better at.. business I guess.
Business for Punks  Break All the Rules   the BrewDog Way
The Millionaire Fastlane  Crack the Code to Wealth and Live Rich for a Lifetime
 Girlboss
The Miracle Morning for Network Marketers  Grow Yourself FIRST to Grow Your Business FAST
Business for Punks  Break All the Rules   the BrewDog Way
The School of Greatness  A Real World Guide to Living Bigger  Loving Deeper  and Leaving a Legacy

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Who can forget these books which while not making it in the top group, deserve a worthy mention nonetheless.
Dragons Den
Tribes
Screw Work
The E Myth Revisited
I Steve Steve Jobs
The Way I See It
What Every BODY is Saying
Purple Cow
Choose Yourself
The Financial Times Guide to Business Start Up 2010
Your Craft Business
Presentation Zen
Get Out While You Can
Writing Your Dissertation
Who Moved My Cheese
Sage 50 Accounts For Dummies 2014
How to Win Friends and Influence People
Getting Things Done
Good To Great
The 4 Hour Work Week
The 7 Habits of Highly Effective People
The Secret
What I Wish I Knew When I Was 20
The One Minute Manager
Anyone Can Do It
The Art of the Start
How to Start Your Own Business for Entrepreneurs
The Richest Man in Babylon
Successful Property Letting
The Hard Thing About Hard Things
The Lean Startup
Tycoon
The Ultimate Small Business Marketing Book
What They Teach You at Harvard Business School
The Financial Times Guide to Business Start Up 2011
Key Management Models
The Lean Startup
The 100 Dollar Startup
Learning to Counsel
Think and Grow Rich
Leadership and the One Minute Manager