How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac (Late 2013) iMac14,1 iMac14,3 - YouTube
Amazon.com: Late-2015 Apple iMac with 2.8GHz Intel Core i5 Quad-core (21.5-Inch, 8GB RAM, 1TB) (Renewed) : Electronics
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Pre-Owned Apple iMac 21.5-inch Desktop "Core i5" 2.9 (Late 2013) 8GB Memory 1TB HDD ME087LL/A - Best Buy
Configure your own 21.5-inch Apple iMac (2013) at OWC
iMac | 2.7 GHz Intel i5 | 21.5 Inch | Late 2013 - Techable.com
Apple 21.5" iMac Desktop Computer (Late 2013) ME086LL/A B&H
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
iMac Intel 21.5" EMC 2638 RAM Replacement - iFixit Repair Guide
21.5 inch late 2013 iMac - RAM upgrade - Apple Community
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
iMac | 3.2 GHz Core i5 | 27 Inch | Late 2013 - Techable.com
Install memory in an iMac - Apple Support
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
Apple iMac 21.5" (8 GB, Intel Core i5, 2.9 GHz, 1TB HDD, GeForce GT 750M 1GB) All-in-One Computer - Silver (ME087LL/A) Late 2013) for sale online | eBay
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
iMac Intel 21.5" EMC 2638 RAM Replacement - iFixit Repair Guide
21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac (21.5-inch, Late 2013) - Technical Specifications
Install memory in an iMac - Apple Support
