OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
16GB RAM Upgrade for the MacBook Pro — Robert OToole Photography
MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide
How to Upgrade the RAM in Your MacBook Pro
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC