Ask HN: Best book on agile management?

Hey HN, My team and I need to brush up on agile management theory. The book should help us be better at organizing and optimizing work (software development projects for our clients), leading agile developers and other knowledge workers, kanban & scrum etc.

If you can recommend a book, please shed some light on how it helped you. Also advice for which book not to read is equally welcome.

Thank you in advance.