"How to Win Friends and Influence People" is a book written by Dale Carnegie. It is generally regarded as a self-help book and was first published in 1936.
The book gives general advice on how to interact with other people in order to persuade them. A revised edition was published in 1981 that modernized the language used as well as cutting sections on writing business letters and improving marriages. The book has sold over 15 million copies to date. Two of its famous adherents are Warren Buffet, who keeps a diploma from the course the book was based on in his office, and Charles Manson, who famously claimed to have used techniques from the book to manipulate women.