"50 Inspirational Books to Transform Your Life" by Tom Butler-Bowdon

If you've read self-help books, and seen the true benefits that this style of literature can offer, you know that of the hundreds of pages you read in a typical book, the real value can be boiled down to a few pages on the greatest lesson offered. This book does just that over and over. It hits you with the key ideas, backs it up, and cross-references it to other books that make a similar point in different ways. Incredibly valuable if you're interested in making sense of and categorizing the vast improvements to self, that self-help points you in the direction of.