CMS 8GB (1X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.4 13.3" Md313Ll/A A1278 - A14 at Amazon.com
Apple MacBook Pro A1278 (Mid 2012) 13.3" Laptop 8GB RAM, Storage options- Grade B
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
MacBook Unibody Model A1278 RAM Replacement - iFixit Repair Guide
MacBook Pro: How to remove or install memory - Apple Support
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
A1286 8GB RAM - Memory (PC3-10600) for MacBook Pro 15" 13" A1278 , MacBook Pro 17" (Early 2011-Late 2011)