Macbook Pro (Late 2011) Memory Upgrade - Apple Community
Adamanta 16GB (2x8GB) Compatible for MacBook Pro (Early/Late 2011, Mid 2012), iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini DDR3L 1600MHz SODIMM Memory Upgrade at Amazon.com
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro 13" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
Apple Adds Early 2011 13-Inch MacBook Pro to Obsolete Products List - MacRumors
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
macos - What is the maximum amount of RAM a 2011 MacBook Pro can utilize? - Ask Different
How to Upgrade RAM on MacBook Pro, iMac & More | AVG