OFFTEK 4GB Replacement Memory RAM Upgrade for Apple MacBook Pro 2.5GHz Intel Core i5 - (13-inch) (DDR3) (Mid-2012) (DDR3-12800) Laptop Memory at Amazon.com
iFixit Launches Repair Guides for Retina MacBook Pro - MacRumors
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro (Retina, 15-inch, Mid 2012) SSD Upgrade - A Leslie Wong Blog
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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
Memory Upgrade for MacBook Pro Late 2012 - YouTube
Is upgrading the mid-2012 MacBook Pro Worth It? - Learn Robotics
Can I replace this part only in Macbook Pro mid 2012? (RAM slot/holder) : r/ macbookpro
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
Is upgrading the mid-2012 MacBook Pro Worth It? - Learn Robotics