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 the SSD in a 13-inch MacBook Pro w/ Retina display (Late 2013 - Early 2015) on Vimeo
Is it possible to upgrade MacBook Pro (Retina, 15-inch, Mid 2014) to 32GB RAM? - Quora
Is it possible to upgrade MacBook Pro (Retina, 15-inch, Mid 2014) to 32GB RAM? - Quora
MacBook Pro 13" Retina (Mid 2014) 2.6 GHz Logic Board
Review: Apple's mid-2014 13-inch MacBook Pro with Retina display | AppleInsider