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 (Retina, 15-inch, Late 2013) - Technical Specifications
Retina MacBook Pros get faster CPUs, more RAM, and a few price cuts | Ars Technica
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
MacBook Pro 13" Retina Display Early 2015 Teardown - iFixit
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
Apple MacBook Pro 2014| A1398 ME294LL/A |Corei7 |16GB RAM |256GB SSD – iPoint
Review: Apple's mid-2014 13-inch MacBook Pro with Retina display | AppleInsider
MacBook Pro 13-inch with Retina display (2014) review | TechRadar