The internet is great for looking up reference material.
I keep a copy of this PDF manual on the iPad.
It covers many SMDs.
There are many other offerings that you can review.
http://www.digikey.com/Site/Global/Layouts/DownloadPdf.ashx?pdfUrl=6B438F7BA5DC49E28D08B066465ABBB9
http://www.talkingelectronics.com/ChipDataEbook-1d/html/SM-Transistors.html
