I read “The DevOps Handbook” a couple of years back. I enjoyed the book and applied a few lessons from that book and experienced first handedly how it improved team productivity and morale. That book is catered to more for engineers than managers. Accelerate did a good job by providing metrics to evaluate each organization. It also covered in-depth knowledge of organizational culture and transformational leadership. It’s a good book for engineering leaders and it provides nuggets of knowledge about how to build high-performing teams.