Surface Mount package standards guide?
There are many resources available on-line.  

I use a service called "PCB Libraries" link.  The link takes you their free version of Expert, which allows you to create symbols and padstacks.

The download page also gives you the option to download the IPC standards for free.  This is only one of the many resources available for free from the download page.

Putting the string "PCB Libraries" into Google brings up many similar resources.