Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Mac RAM Upgrade, Best iMac Memory Upgrade – Best Reviews
Apple iMac (27-inch, Late 2012) iMac13,2 | Memory RAM & SSD Upgrades | Crucial.com
iMac Intel 21.5" EMC 2544 Teardown - iFixit
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
Install memory in an iMac - Apple Support
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 RAM in a Mac | Macworld
How to Upgrade RAM on MacBook Pro, iMac & More | AVG