Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
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
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
Memory RAM Upgrade for Apple iMac 27-inch Late 2012 4GB/8GB DDR3 SODIMM | eBay
Install memory in an iMac - Apple Support
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