How to Win Friends and Influence People, written by Dale Carnegie in 1936.

 Six ways to make people like you

Become genuinely interested in other people.

Smile.

Remember that a person's name is to that person, the sweetest and most important sound in any language.

Be a good listener. Encourage others to talk about themselves.

Talk in terms of the other person's interests.

Make the other person feel important - and do it sincerely.