Apple MacBook Pro with Retina Display (13-inch, 2013) review: Not a Retina MacBook Air, but awfully close - CNET
How to upgrade Apple MacBook Pro RAM - YouTube
Macbook Pro 15-inch, Retina Core i7 / 2.3GHz / 16GB RAM / 512GB SSD, Late 2013 | eBay
Amazon.com: Odyson - Logic Board 2.3GHz i7, 16GB Replacement for MacBook Pro 15" Retina A1398 (Mid 2012, Early 2013) : Electronics
Apple Macbook Pro Retina Late 2013 15" - ME874LL/A - MacBookPro11,3 - A1398 - 2745
MacBook Pro: How to remove or install memory - Apple Support
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 RAM at Amazon.com
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 A1398 16GB RAM 1TB SSD | eBay
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
mac - Can I upgrade the memory on late 2013 Retina MacBook Pro? - Ask Different
MacBook Pro 15" Repair - 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