How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Upgrading My MacBook Pro i5 (Mid 2012) With 16GB Memory - miapple.me - Tech.Blog
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
Why the 2012 non-Retina MacBook Pro still sells – Marco.org
Teardown of Mid-2012 MacBook Air Reveals Tweaked SSD Connector - MacRumors