In addition to the Scrum Guide, the following books are recommended by Scrum.org for PSM I exam preparation. They are also excellent resources to develop a better understanding of Agile. Clicking on the book will bring you to the Amazon.com book page.
Agile reading recommendations
Agile Software Development with Scrum (Series in Agile Software Development) 1st Edition
eXtreme Programming is an ideal many software shops would love to reach, but with the constant pressures to produce software quickly, they cannot actually implement it. The Agile software process allows a company to implement eXtreme Programming quickly and immediately-and to begin producing software incrementally in as little as 30 days! Implementing eXtreme Programming is easier said than done. The process can be time consuming and actually slow down current software projects that are in process. This book shows readers how to use SCRUM, an Agile software development process, to quickly and seamlessly implement XP in their shop-while still producing actual software. Using SCRUM and the Agile process can virtually eliminate all downtime during an XP implementation.
Scrum Mastery: From Good To Great Servant-Leadership 1st Edition
The basics of being a ScrumMaster are fairly straightforward: At face value all a ScrumMaster needs to do is facilitate the Scrum process and remove impediments. But being a great ScrumMaster, one who truly embodies the principles of servant-leadership and helps move a team to the high performance levels possible with Scrum, is much harder and much more elusive.
Agile Retrospectives: Making Good Teams Great
See how to mine the experience of your software development team continually throughout the life of the project. The tools and recipes in this book will help you uncover and solve hidden (and not-so-hidden) problems with your technology, your methodology, and those difficult “people” issues on your team. Don’t miss this agile reading!