NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
32GB Kit (4 x 8GB) PC3-12800 RAM for Apple iMac Late 2014 - 27 Inch Retina
A1502 Logic Board (2.4GHz Core i5, 4GB RAM) for Apple MacBook Pro Retina 13-inch A1502 (Late 2013 – Mid 2014) APN : 661-8145 PPN : 820-3476-A, 820-3536-A - WIT Computers
macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different
Upgrading Ram in a Macbook Pro 13" | How to Upgrade Ram on 13" Macbook Pro - YouTube
How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld
Adamanta 8GB (1x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
Review: Apple's mid-2014 15-inch MacBook Pro with Retina display | AppleInsider
New MacBook Pro makes DIY upgrades and repairs tough
iFixit produces repair manual for MacBook Pro with Retina display, tests DIY's limits | Engadget
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
The Super MacBook Pro Upgrade (1TB RAID SSD Upgrade + RAM Upgrade 2013) - YouTube