A very classic one, also recommended by many other people: How to win friends and influence people, Dale Carnegie. It was the original "self help" book, and t

A very classic one, also recommended by many other people: How to win friends and influence people, Dale Carnegie. It was the original "self help" book, and the principles there are so simple yet powerful that will resonate a self evident. However these are mostly ignored, and the same as with common sense which happens to be the less common of the senses.