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 PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
MacBook Pro Retina 13 and 15-inch Late 2013 - Mid 2014 SSD upgrade - Flexx memory
Retina MacBook Pro review (15in, 2.2GHz, mid 2014) | Macworld
Apple MacBook Pro A1502 Mid-2014 13" Retina i7 @ 3.0GHz 16GB RAM 500GB SSD *READ | eBay
Apple MacBook Pro 15 Retina - Mid 2014 Reviews, Pros and Cons | TechSpot
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET
MacBook Pro: How to remove or install memory - Apple Support