Ask HN: CI and CD and DevOps books

Can anyone recommend any books on the subject? Amazon led me to these, for those that read them what is your opinion? http://www.amazon.com/Continuous-Integration-Improving-Software-Reducing/dp/0321336380/ http://www.amazon.com/Continuous-Delivery-Deployment-Automation-Addison-Wesley/dp/0321601912 http://www.amazon.com/The-Phoenix-Project-Helping-Business/dp/0988262509/ Given the rapid change of the playing field, my concern is that they may be outdated (and the last one being apparently more manager oriented).