Barry Overeem created a list of must-reads for agile newbies:
The Agile Manifesto
The Scrum Guide – Jeff Sutherland, Ken Schwaber
The Power of Scrum – Rini van Solingen
Scrum: A Pocket Guide – Gunther Verheyen
Succeeding with Agile – Mike Cohn
The Agile Samurai – Jonathan Rasmusson
The Five Dysfunctions of a Team – Patrick Lencioni
The Scrum Field Guide – Mitch Lacey
The Phoenix Project – Gene Kim, Kevin Behr, George Spafford
Kanban – David J. Anderson
Clean Code – Robert C. Martin
Read his complete blogpost here: http://www.barryovereem.com/the-reading-list-for-agile-newbies/