There are many books on interpersonal relationships. The following are a few of the more classic ones: 1 The Impact Factor- Theodore The book introduced six principles of influence that can help people better connect and influence others. 2. The Art of Communication ·The New York Times This book introduced the basic principles and techniques of communication to help people better express their opinions and ideas and build good interpersonal relationships. 3. The Social Animal- Golman This book introduced the basic theories and experiential research of social psychology, exploring the nature and causes of human social behavior and how to better understand and respond to social behavior. 4. Nonviolent Communication. Minzberg This book introduced an effective method of communication--non-violent communication to help people better express their needs and ideas and build deeper and more stable interpersonal relationships. The Art of Negotiating (The negotiation skills of a lifetime) ·G. Hammond This book introduced the basic principles and techniques of negotiation to help people better negotiate with others to reach a mutually acceptable outcome. These are some of the more classic interpersonal books that I hope will be of help to you.