Here is a list of the top 6 books every PO should read: 1. Essential Scrum by Ken Rubin 2. User Stories Applied by Mike Cohn 3. User Story Mapping by Jeff Patton 4. Scrum - The Art of Doing Twice the Work in Half the Time - Jeff Patton 5. The Stable Framework by Michael J Berry 6. Product Roadmaps by Bruce McCarthy

BONUS Books: Agile Estimating & Planning by Mike Cohn & Getting Things Done by David Allen