How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
The Case of the Late-2012 iMacs - MacStories
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
How To Upgrade RAM in a Mac | Macworld
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET