SQL Server Books l recommend:
- SQL Server Execution Plans – Grant Fritchey [Simple Talk Publishing]
- Querying SQL Server 2012 – Ben-Gan I., Sarka D., Talmage R. – Training Kit (Exam 70-461) [Microsoft Press]
- Pro SQL Server 2012 Integrated Services – Frances Rodrigeues [apress]
- Professional SQL Server 2012 Internals & Troubleshooting – Bolton, Christian [John Wiley]