Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
Macbook Pro Apple 13" inch Catalina 10.15 (2012-2014 model) w/ 16GB RAM Upgrade! | eBay
Teardown of Mid-2012 MacBook Air Reveals Tweaked SSD Connector - MacRumors
MacBook Pro: How to remove or install memory - Apple Support