MacBook Pro (Retina, 15-inch, Late 2013) - Technical Specifications
How to upgrade SSD in late 2013 MacBook Pro with retina display - YouTube
MacBook Pro Retina 15” late 2013 shows sometimes lines on the screen when ram is full. : r/macbookpro
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
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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
macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different