Now in its 3rd edition, the System Center 2012 R2 Configuration Manager: Mastering the Fundamentals is a masterful work of technical content. Kent Agerlund, Microsoft MVP and IT/Dev Connections speaker, has written a very popular and very comprehensive manual for working with ConfigMgr 2012.
For the latest update, Kent completely revised the tome to include every bit of new knowledge required to work with Microsoft's latest revision to its endpoint management product. Kent has 17 years of experience working with ConfigMgr in various scenarios and with a variety of company levels including small, midsize, and Enterprise.
Using the book, many ConfigMgr administrators have been able to go from point A to Point Z to produce a ConfigMgr implementation that is productions ready. And, once the implementation is complete, the book makes for a great reference.
The update book is available in softcover on Amazon for around $40 U.S. and a Kindle version is planned to release in the coming weeks.
You can get it here: System Center 2012 R2 Configuration Manager: Mastering the Fundamentals, 3rd Edition