Problem Solving 101 by Ken Watanabe. This book is about how to solve problems in our daily lives. The contents are quite simple, short, and well presented.
Cashvertising by Drew Eric Whitman. Basic principles of advertising and sales, useful for pretty much anyone in the field, from creative types to PPC guys. You will find here some ideas about copy, positioning of the product or customer psychology.
Tested Advertising Methods by John Caples. An excellent book packed with hands-on, practical information. Writers of all genres can benefit from John Caples' advice and strategies for writing headlines and finding the right appeal.
The Obstacle is the Way by Ryan Holiday. This book reveals that formula for the first time—and shows us how we can turn our own adversity into advantage.
The Personal MBA by Josh Kaufman. The author concentrates in explaining in a concise way what is really important, sharing his knowledge with the reader. It contains the fundamentals, and this knowledge is essential whether you are in sales, marketing or you are starting your own business.
The Millionaire Fastlane by M.J. de Marco. An alternative road to wealth that actually ignites dreams and creates millionaires young, not old. Hit the Fastlane, crack the code to wealth, and find out how to live rich for a lifetime.
The 4-hour workweek by Timothy Ferris. Whether you are an overworked employee or an entrepreneur trapped in your own business, this book is the compass for a new and revolutionary world.
Breakthrough Advertising by E. M Schwartz. This book is a classic staple in advertising, anyone who is looking to improve their copy writing skills (persuasive writing) should read this and learn from the lessons Schwartz offers.
Brain Rules by John Medina.In Brain Rules, Dr. John Medina, a molecular biologist, shares his lifelong interest in how the brain sciences might influence the way we teach our children and the way we work.
Getting Results the Agile Way by J.D Meier. This book discusses a system for accomplishing things that focuses on "results" rather than "tasks".