How to install an SSD on a 15-inch Retina MacBook Pro
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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
Refurbished Apple MacBook Pro 15 Inch Quad-Core i7 2.6 GHz (Mid 2012) MC976B/A – Affordable Apple Mac Specialist
Now Here's a MacBook Pro That's Easy to Repair | WIRED
2012 Macbook Pro 15" A1286 RAM Upgrade - YouTube
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
16 GB RAM Upgrade on MacBook Pro 15" (mid 2012) NON Retina - YouTube
13-inch Retina MacBook Pro Review (Late 2012)
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