Why I'm Not Buying Apple's Newest and Most Powerful MacBook Pro Anymore
Apple MacBook Pro (15-inch, 2013) review: Apple's high-end laptop gets better battery life and a lower price - CNET
Apple MacBook Pro 15" Retina Quad i7 @ 2.0ghz 8GB Ram 128gb SSD OS 10.15 | eBay
Refurbished 2015 Apple MacBook Pro Quad Core i7 2.8 15" Dual Graphics 16GB RAM 2TB SSD MJLU2LL/A A1398
Memory RAM Upgrade for Apple MacBook Pro 15-inch Mid 2012 4GB/8GB DDR3 SODIMM | eBay
Apple MacBook Pro 15" Retina 2.3GHz 8GB Ram Logic Board 2012 661-6481 820-3332 | eBay
Retina, round two: Apple's 15-inch 2013 Retina MacBook Pro reviewed | Ars Technica
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET
15" 15 Inch Retina MacBook Pro A1398 Mid 2015 Complete Disassembly (Almost) SSD Upgrade - YouTube
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com