Dale Carnegie’s How to Win Friends and Influence People is one of the most influential self-improvement books of all time.

Lately, however, there has been a spate of books on the art, or science, of making friends. Dorothy Carnegie, Dale’s widow, has joined in, with a revised Eighties edition of her husband’s classic. It ...

Dale Carnegie once said, “You can make more friends in two months by becoming interested in other people than you can in two years by trying to get other people interested in you.” That’s ...