This is the classic self-help book by Dale Carnegie. From Wikipedia: http://en.wikipedia.org/wiki/How_to_Win_Friends_and_Influence_People
Personally, I'm not a huge fan of this book. Its message isn't necessarily a bad one, but it is quite repetitive in my opinion. I shouldn't be bad-mouthing the book I'm trying to sell, but if you were going to read it anyway... :)