Apple iMac 21.5-inch 3.3GHz Core i3 (Early 2013) ME699LL/A (Renewed)
Install memory in an iMac - Apple Support
Apple iMac Upgrades | SimplyFixIt
CMS 16GB (4X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I3 3.06 21.5-Inch (Mid-2010) - A28 at Amazon.com
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Apple Posts iMac (Late 2013) Memory Specifications
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Configure your own 21.5-inch Apple iMac (2013) at OWC
iMac Intel 21.5" EMC 2638 Teardown - iFixit
Apple iMac 21.5" All-in-One Desktop Core i3-3225 3.3GHz 4GB RAM 500GB HDD Mac OS Mojave Early-2013 w/ Keyboard & Mouse ME699LL/A
SOLVED: Need more ram for iMac 21.5 late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
iMac (21.5-inch, Late 2013) - Technical Specifications
Install memory in an iMac - Apple Support
Apple iMac 21.5-inch 2.7GHz Quad-core i5 (Late 2013) | mac of all trades
Apple iMac review (2013) | Engadget
iMac Intel 21.5" EMC 2544 RAM Replacement - iFixit Repair Guide
Performance - Apple 21-inch iMac, late 2013 review | TechRadar
The Display - 21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac Intel 21.5" EMC 2544 RAM Replacement - iFixit Repair Guide
21.5 inch late 2013 iMac - RAM upgrade - Apple Community
Used Apple iMac 21.5-inch (Aluminum) 2.7GHZ Quad Core i5 (Late 2013) ME086LL/A - GainSaver
New CPUs, faster Wi-Fi, same flaws: Apple's 2013 iMac reviewed | Ars Technica
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
Install memory in an iMac - Apple Support
iMac Late 2013 21.5 SSD Upgrade - YouTube
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube
