MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
Apple MacBook Pro: RAM upgrade (HowTo)
8GB RAM Upgrade for 2011 MacBook Pro & Mac Mini Core i5 & i7 – $34 | OSXDaily
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
MacBook Pro 15" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
How to Upgrade RAM in MacBook Pro 17" 2011 16GB Install Tutorial - YouTube
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
How To: Install RAM in Macbook Pro (Unibody - 2009 to 2011) - YouTube
Upgrading the Late 2011 MacBook Pro to 16 GB of RAM! - YouTube
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro: How to remove or install memory - Apple Support
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com