MacBook Pro (13-inch, Mid 2012) Hard Drive (and possibly RAM) replacement : r/mac
Is upgrading the mid-2012 MacBook Pro Worth It? - Learn Robotics
A-Tech 8GB Kit (2x4GB) 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
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
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
How to make your MacBook Pro faster – upgrading a MacBook Pro mid-2012 to SSD and more RAM memory - Andy the webdeveloper
Mid-2012 Macbook Pro 16GB RAM Upgrade How To - YouTube
parts-quick 8GB Memory for Apple MacBook Pro 13 inch (Mid 2012) PC3-12800S 1600MHz DDR3 SODIMM Compatible RAM Brand at Amazon.com
4GB Ram Memory (PC3L-12800, DDR3 1600MHz) for Apple MacBook Pro 15 inch A1286 Mid 2012. Apple MacBook Pro 13 inch A1278 - Mid 2012. iMac 21.5 inch A1418 Late 2012, A1418 Early 2013, A1 - MacBook Parts South Africa
Mid-2012 MacBook Pro Unibody RAM Upgrade - YouTube
4GB Memory Module for Apple MacBook Pro 13-inch (Mid 2012) 1600MHz DDR3 (PC3-12800) (PARTS-QUICK Brand) at Amazon.com
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.5 13" Mid-2012 - A7 at Amazon.com
2GB Memory (PC3-12800, DDR3 1600MHz) for Apple MacBook Pro 15 inch A1286 Mid 2012. iMac 21.5 inch A1418 Late 2012, A1418 MacMini A1347 - Late 2012