I have been involved in transitioning two of the largest organizations (in the North America) to value driven project methodologies such as Agile, Scrum, and Lean. During these transitions, I have coached several teams, managers, and executives on Agile Practices and principles, and have often been asked for recommended reading list. I have accumulated a list of references that I often recommend my new teams read when starting their journey on Agile. Here is the list for your reference.
Books
Agile Project Management with Scrum (Schwaber)
User Stories Applied (Cohn)
Scrum and XP from the Trenches.pdf (Kniberg)
Scaling Software Agility (Leffingwell)
Agile Estimating and Planning (Cohn)
Implementing Lean Software Development: From Concept to Cash (Poppendieck)