MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
How to upgrade Apple MacBook Pro RAM - YouTube
16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
MacBook Pro: How to remove or install memory - Apple Support
Apple MacBook Pro A1398 EMC 2673 i7-3740QM 2.70GHz 16GB RAM 256GB SSD Early 2013 | eBay
Macbook Pro upgrade kit for model A1398 Hardrive and Memory | eBay
Used Apple 15.4-inch MacBook Pro A1398 2014, 2.8 GHz Intel Core i7, 16GB RAM, 256GB SSD, Grade B - Silver - Walmart.com
Logic Board 2.7ghz I7 Quad 16gb RAM for 15" MacBook Pro Retina A1398 Early 2013 for sale online | eBay
Amazon.com: 2.6 GHz 16GB RAM Logic Board 820-3332-A for Apple MacBook Pro 15" Retina A1398 2012 Early 2013 : Electronics
upgrade - Does the new Macbook Pro with Retina display have user-upgradeable RAM? - Ask Different
16GB 2X8GB RAM Memory for Apple MacBook Pro A1398 Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-10600 1333MHz Upgrade - Walmart.com
16 GB RAM Upgrade on MacBook Pro 15" (mid 2012) NON Retina - YouTube
The Super MacBook Pro Upgrade (1TB RAID SSD Upgrade + RAM Upgrade 2013) - YouTube
Restored Apple A1398 MC975LL/A 15.4" MacBook Pro, Mac OS X 10.11 El Capitan, Intel Core i7-3615QM Processor, 16GB RAM, 256GB Solid State Drive (Refurbished) - Walmart.com