New Scrum Master Recommended Reading

Succeeding with Agile: Software Development Using Scrum
This is a great book for understanding how to get started using scrum. It covers patterns for adopting scrum, your first project, how the roles change in a scrum environment and how scrum might fit within your organisation.
Mike Cohn

Extreme Ownership: How U.S. Navy Seals Lead and Win
This is a book about leadership and will help scrum teams take ownership and accountability for the products they are delivering.
Jocko Willink

Agile Retrospectives: Making Good Teams Great 
The retrospective is at the heart of continuous improvement in scrum. This book will provide you with a great framework for running a fantastic retrospective.
Esther Derby and Diana Larsen

Extreme Programming Explained: Embrace Change
Scrum is just the tip of the iceberg. Extreme programming includes many of the technical practises that help good scrum teams thrive, such as pair programming, continuous integration, and collective ownership. 
Kent Beck

Coaching Agile Teams: A Companion for ScrumMasters, Agile Coaches, and Project Managers in Transition
The leadership style of a scrum master may be different to what you have traditionally done. This book describes the journey from traditional project management command and control style to a servant leader style more in keeping with scrum mastery. There are some fantastic practical tools in this book.
Lyssa Adkins

Toolbox for the Agile Coach - Visualization Examples, How great teams visualize their work
As a scrum master you want to drive empirical thinking and enable your team to discover ways of reflecting and using information. For example, how do you visualise your product backlog, the number of interruptions that you get in a sprint, or even how happy your team is.
Jimmy Janlén

Scrum Mastery: From Good To Great Servant-Leadership
This book helps you go beyond just facilitating the scrum process, facilitating all of the events etc., to what it truly takes to embody being a great scrum master.
Geoff Watts

Workout: Games, Tools & Practices to Engage People, Improve Work, and Delight Clients
A set of tools to help you build your team and create an amazing environment for people to thrive in 
Jurgen Appelo

User Story Mapping: Discover the Whole Story, Build the Right Product
The quality of your product is directly proportional to the quality of your product backlog. User story mapping is a proven technique for creating the product backlog.
Jeff Patton

Agile Estimating and Planning 1st Edition
Estimation can be complex, time consuming and not much fun. Additionally, agile teams often approach estimating differently.  This book demystifies the story point approach to agile estimation.
Mike Cohn

The Scrum Guide
You have already read the screen guide to pass your level 1 exam. The scrum guide is often updated based on empirical data from the thousands of teams using Scrum. A revisit on a frequent basis will give you the latest most up to date thinking around it.
Ken Schwaber and Jeff Sutherland