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
GUIDE] Assemble NVMe SSD to A1278 MacBook Pro (MBP 13-inch 2012 + NevBolt-1) - YouTube
Mid 2012 13" inch MacBook Pro A1278 Disassembly RAM SSD Hard Drive Upgrade Repair OSX Install - YouTube
2GB Black Diamond Memory Module for Apple MacBook Pro A1278 (13.3" Core 2 Duo 2.4GHz) DDR3 SO-DIMM 204pin PC3-8500 1066MHz Upgrade - Walmart.com
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.4 13.3" Md313Ll/A A1278 - A29 at Amazon.com