There are several books about Disciplined Agile available to you.
For Agile/Lean Teams Who Want to Improve
Scott Ambler and Mark Lines, Disciplined Agile Inc., 2019
This book is an indispensable guide for agile coaches and practitioners to identify what techniques – including practices, strategies, and lifecycles – are effective in certain situations and not as effective in others. This advice is based on proven experience from hundreds of organizations facing similar situations to yours. Every team is unique and faces a unique situation, therefore they must choose and evolve a way of working (WoW) that works for them. Choose Your WoW! describes how to do this effectively, whether they are just starting with agile/lean or if they’re already following Scrum, Kanban, SAFe, LeSS, Nexus, or other methods.
For Senior Leaders
Scott Ambler and Mark Lines, Disciplined Agile Inc., 2017
This book overviews the Disciplined Agile (DA) toolkit in its entirety – Disciplined Agile Delivery (DAD), Disciplined DevOps, Disciplined Agile IT (DAIT), and Disciplined Agile Enterprise (DAE) – and provides advice for effectively adopting DA strategies within your organization.
A Quick Read
Mark Lines and Scott Ambler, Disciplined Agile Inc., 2018
This book is a short read that overviews the Disciplined Agile Delivery (DAD) portion of the DA toolkit. It also works through a case study of a Scrum team that takes it to the next level with DAD, applying DAD to address the myriad of activities that Scrum leaves up to you and then eventually to evolve into a Disciplined DevOps approach.
The Book That Started it All
Scott Ambler and Mark Lines, IBM Press, 2012
This book has been replaced by Choose Your WoW!, described above. It’s a great book, but Choose Your WoW! is a better, up-to-date resource.