The Phoenix Project is a really inspirational novel, good for 'getting' the devops mindset and also as a tool to get other people in your organisation on board.

https://www.amazon.co.uk/Phoenix-Project-DevOps-Helping-Busi...

The DevOps Handbook is a sister book to The Phoenix Project which is more technically oriented around the practicalities of closer integration between Dev and Ops.

https://www.amazon.co.uk/DevOps-Handbook-World-Class-Reliabi...

For anybody wanting to learn DevOps today, "The DevOps Handbook" is the canonical text. https://www.amazon.com/DevOps-Handbook-World-Class-Reliabili...