A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Memory Upgrade
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
16 GB RAM Upgrade on MacBook Pro 15" (mid 2012) NON Retina - YouTube
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
Review Apple MacBook Pro 15 Retina 2.3 GHz Mid 2012 - NotebookCheck.net Reviews
A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Memory Upgrade
Apple Motherboard MacBook Pro Retina 15 inch A1398 (Logic Board) 2.7GHz Core i7, 8GB RAM (Mid 2012) - 661-6481 - Apple Force
Can I upgrade the RAM of the MacBook Pro 13' Retina from 8gb to 16gb after/during purchase? - Quora
How to install an SSD on a 15-inch Retina MacBook Pro
Amazon.com: UESWILL Smooth Matte Hard Case Cover Compatible with (Mid 2012- Mid 2015) MacBook Pro 15 inch with Retina Display (No Touch Bar, No CD-ROM) (Model: A1398), Black : Electronics
A1398 Apple Keyboard (US Layout) for Apple MacBook Pro Retina 15 inch (Mid 2012 - Mid 2015)