SharePoint 2013 - Planet of the Apps

The one book you need to get started with what is perhaps the biggest difference between SharePoint 2010 and SharePoint 2013. This book covers the basics of Apps, the inside workings, Provider hosted apps, and Azure hosted apps. It talks of development experience and nuances of both on-premises Apps and Office 365 Apps. Note: This book does not cover anything about Office Client Apps.

Prefer paper? Please see http://www.amazon.com/SharePoint-2013-Planet-Apps-Volume/dp/1480077089/