Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
How To Upgrade RAM on the Apple iMac 2012 - 2013 RAM Upgrade - 21.5 inch model - YouTube
Install memory in an iMac - Apple Support
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
How To Upgrade RAM on the Apple iMac 2012 - 2013 RAM Upgrade - 21.5 inch model - YouTube
Install memory in an iMac - Apple Support
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
Install memory in an iMac - Apple Support
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
iMac Pro Memory Maxxer RAM Upgrade Kit
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013