MacBook Pro (13-inch, Early 2011) - Technical Specifications
How To: MacBook Pro Late 2011 Memory Upgrade - 16GB (2 X 8GB) : 6 Steps - Instructables
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
MacBook Pro 13" Unibody Early 2011 Logic Board Replacement - iFixit Repair Guide
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
Apple MacBook Pro 13-inch, Late 2011 - 2.4GHz Core i5 Memory RAM Upgrades - Low Cost Delivery & Guaranteed Compatible | Mr Memory®
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro( Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
Apple MacBook Pro 13 (Early 2011) review: Apple MacBook Pro 13 (Early 2011) - CNET
MacBook Pro: How to remove or install memory - Apple Support
Display Quality & Peripherals - Apple 15-inch MacBook Pro (Late 2011) Review