A-Tech 16GB Kit (2x8GB) 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
The Mac Pro Review (Late 2013)
Late 2013 27-inch iMac: Unboxing and Specs (HD) - YouTube
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple 21.5" iMac® Intel Core i5 (2.3GHz) 8GB Memory 1TB Hard Drive Silver MMQA2LL/A - Best Buy
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Apple Mac Pro review (2013) - The Verge
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
Install memory in an iMac - Apple Support
iMac (27-inch, Late 2013) - Technical Specifications
Apple 21-inch iMac, late 2013 review | TechRadar
How To: Apple Mac Pro RAM Upgrade! (Late 2013) - YouTube
2019 Apple Mac Pro vs. 2013 Mac Pro: How Far Has the Hardware Come? | PCMag
iMac (21.5-inch, Late 2013) - Technical Specifications
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
New Apple iMac (2013) 21.5" Unboxing & Demo - YouTube
iMac (Late 2013) | Low End Mac
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013