Regarding the question: What are must-read books for DevOps engineer to become a true expert?
I see its being down voted, and I can understand why. However, I personally feel like this would be a great starting point for a community wiki answer, much like the 'list of useful memes': What are known useful and misleading memes in the DevOps culture?
Would it be appropriate to leave this question open, and simply convert the current answer to a wiki so we can all add to it over time?