Chapter 1 of http://www.red-gate.com/community/books/accidental-dba, there's almost certainly something in http://www.amazon.com/Server-Performance-Tuning-Distilled-Experts/dp/1430219025/ref=tmm_pap_title_0?ie=UTF8&qid=1387523151&sr=8-1 and my manual methods are detailed in https://www.simple-talk.com/sql/performance/finding-the-causes-of-poor-performance-in-sql-server,-part-1/
Or buy a good 3rd party monitoring tool
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability