upgrade - 32gb of RAM on a 2011 or 2012 15/17-inch MacBook Pro using Crucial's 16gb single DIMMs - Ask Different
Computer Science and Technology: Crucial 16GB RAM upgrade for my Macbook Pro (Late 2011)
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
Memory Installation Guides | Apple Mac Systems | Crucial.com
8GB Kit (4GBx2) Upgrade for a Apple MacBook Pro 2.0GHz Intel Core i7 (15-inch DDR3) Early-2011 System (DDR3 PC3-10600, Non-ECC, ) at Amazon.com
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
8GB Upgrade for a Apple MacBook Pro (13-inch, Early 2011) System (DDR3 PC3-10600, Non-ECC, ) at Amazon.com