Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple iMac 2013 (Late) 21.5-inch (iMac 14,3) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
Install memory in an iMac - Apple Support
Refurbished Apple iMac 14,1/i5-4570S/16GB Ram/1TB HDD/21.5"/A (Late 2013) | SafepcDirect
iMac (21.5-inch, Late 2013) - Technical Specifications
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
16GB Kit (2 x 8GB) PC3-12800 RAM for Apple iMac Late 2013 - 27 Inch MF125LL/A Memory Upgrade Kit