Make no mistake, there are a lot of book offers out there regarding System Center Configuration Manager, and witch each book around 300-600 pages long getting the right one from the start can be a hassle; thankfully I have a suggestion for you System Admins that want to enter in the SCCM environment.
The number 1 book that every system admin should start with is without a doubt System Center 2012 R2 Configuration Manager Unleashed( Supplement to System Center 2012 Configuration Manager (SCCM))[SYSTEM CENTER 2012 R2 CONFIGUR][Paperback]
This is a very comprehensive book; it will you from the basics to all the possibilities that SCCM has to offer, and it does it at such a detailed level, that you will often find yourself going throw its pages again and again when you are in need of help.
It also has a updated version System Center 2012 R2 Configuration Manager Unleashed: Supplement to System Center 2012 Configuration Manager (SCCM) Unleashed by Meyler, Kerrie, Sandys, Jason, Ramsey, Greg, Andersen, Dan, (2014) Paperback
The next book you will surely need is hand-on-guide to get into SCCM. This is where Understanding System Center 2012 SP1 Configuration Manager: The Walkthrough Book comes into play.
This book is written by 1 author only, Raphael Perez and it does a amazing job of taking you step-by-step throw a vast amount of examples and scenarios with an hands on attitude first.
The first time i gone throw this book i had the “Aha moment” more times than i can count and builds up on your knowledge from Unleashed with examples.
Aside of these 2 books there are a few notable mentions also worth looking into:
System Center 2012 R2 Configuration Manager: Mastering the Fundamentals, 3rd Edition – complete lab guide for a SCCM Environment.
Mastering System Center 2012 R2 Configuration Manager – Strong reference for advanced SCCM issues.
And the new kid on the block, again from Raphael Perez is his new book: System Center 2012 R2 Configuration Manager: Automation from Zero to Hero
I bought a lot of SCCM books and these are on my top list, and i can surely say to you that these are among the best reads i got and the best “bang for my buck”.
Hope it helps, i will try to keep this list updated so you always have the best choice available and start off your way into SCCM the right way !