How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
How to Upgrade RAM on a 2019 MacBook Pro
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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
MacBook Pro Memory Upgrade - How-tos and DIY - Corsair Community