How to Upgrade the SSD in a 15-inch MacBook Pro w/ Retina display (Mid 2012–Early 2013) on Vimeo
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro (Retina, 15-inch, Early 2013) - Technical Specifications
How to Upgrade the SSD on a MacBook Pro Retina Early/Mid/Late 2013/2014/2015 - Replacement Tutorial - YouTube
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
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 13” Retina Early 2013 Catalina 2.6GHz i5 8GB RAM 256GB SSD | eBay
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different
Logic Board 2.7Ghz i7 8Gb Ram For 15" MacBook Pro Retina A1398 Early 2013 / A+ | eBay
Apple MacBook Pro Retina 15 inch 2013-10 - Notebookcheck.net External Reviews
13″ MacBook Pro with Retina Display (Early 2013) | Low End Mac
MacBook Pro Retina 15" A1398 Early 2013 Logic Board 2.7 Ghz i7 16Gb Ram warranty | eBay
Apple MacBook Pro (15-inch, 2013) review: Apple's high-end laptop gets better battery life and a lower price - CNET