I created a book list on Amazon which contains the books referenced in the CCDE roadmap. I am updating it to contain only the books which are in print. Of note, the Traffic Engineering with MPLS book (Osborne) was out of print. You’ll need to buy the paperback version for one that is in print.
MPLS and VPN Architectures (Pepelnjak) is also out of print. This book was very difficult to understand for me and I would not recommend it for a beginner. Either take a course in companion with this book or begin with a book like MPLS Fundamentals (DeGhein).
Advanced MPLS Design and Implementation is also out of print. This book received good reviews on Amazon, so I chose to leave it on the list.