MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
Samsung ram Memory Upgrade DDR3 PC3 12800, 1600MHz, 204 PIN, SODIMM for 2012 Apple MacBook Pro's, 2012 iMac's, and 2011/2012 Mac Mini's (8GB kit (2 x 4GB)) at Amazon.com
MacBook Pro: How to remove or install memory - Apple Support
How to upgrade the memory in a Non-Retina 15-inch MacBook Pro 2011-2016 MacBookPro8,1 MacBookPro9,1 - YouTube
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 SODIMM PC3-12800 204-Pin SO-DIMM Memory Upgrade at Amazon.com
mac - What is the maximum RAM size for MacBook Pro Mid 2012? - Ask Different
MacBook Pro: How to remove or install memory - Apple Support
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)