MacBook Pro (Retina, 13-inch, Late 2013) - Technical Specifications
MacBook Pro "Core i7" 2.3 15" Late 2013 (DG) Specs (Retina Late 2013 15", ME294LL/A, MacBookPro11,3, A1398, 2745): EveryMac.com
Review: Apple's late-2013 15-inch MacBook Pro with Retina display | AppleInsider
Amazon.com: Apple MacBook Pro ME865LL/A 13.3-Inch Laptop with Retina Display (OLD VERSION) (Renewed) : Electronics
SOLVED: Can RAM be upgraded? - MacBook Pro 13" Retina Display Mid 2014 - iFixit
MacBook Pro Retina 15" Late 2013 - Upgrad… - Apple Community
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, 15-inch, Late 2013) - Technical Specifications
Sold - 15" MacBook Pro Retina Late 2013 // $895 - Boulder Mac Repair
16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube