Apple 21.5" Pre-Owned iMac Desktop Intel Core i5 2.7GHz 8GB Memory 1TB HDD (2012) Silver MD093LL/A - Best Buy
The Case of the Late-2012 iMacs - MacStories
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Install memory in an iMac - Apple Support
Apple iMac "Core i5" 2.7 21.5-Inch (Late 2012), 1 TB HD, 8GB RAM, OS 10.11.6 - Imagine41
iMac Intel 21.5" EMC 2544 Repair - iFixit
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
What Does It Take To Upgrade a 2012 iMac 21.5"?
iMac Upgrade Kits – iFixit Store
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
A First Look At The 2012 21.5-inch iMac, And How It Compares To Generations Past | TechCrunch
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Can you upgrade the RAM in the 27-inch iMac? | iMore
21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Apple's 27" iMac Late 2012 model. How to upgrade the ram to 16GB - YouTube
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET