My go-to book is always FISH! I first heard about it at a Schwarzkopf PH Club event about 10 years ago and have been through three copies so far because I lend them out and don’t get them back!
The lessons about team building, making someone’s day, making the work place fun and fulfilling in this book are invaluable to me. I feel everyone, in all types of businesses, would benefit from this quick read.