Excellent book. A must have for parents. There are more books out there like this one for different situations and I recommend you getting as many as you can. My son loved reading these and would tell me how to behave in certain situations.
Being a Bad Sport by Joy Berry is an easy book to understand for younger readers. It has great pictures which show how others feel when winning and losing games. It teaches children how to act and be a fun person to play with. It also teaches a child how to respond when they are being treated badly by someone who isn't a good sport.