Samsung ram Memory 8GB kit (2 x 4GB) DDR3 PC3-12800,1600MHz for 2012 Apple MacBook Pro's, iMac's and 2011/2012 Mac Mini's at Amazon.com
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Ram upgrade in Macbook pro mid 2012 - Apple Community
16GB Kit (2 x 8GB) PC3-12800 RAM for Apple MacBook Pro Mid 2012 - 13 Inch
16GB 2X8GB RAM Memory for Apple MacBook Pro 2.9GHz Intel Core i7 (13-inch DDR3) Mid-2012 Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-12800 1600MHz Upgrade - Walmart.com
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini at Amazon.com
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I7 2.3 15" Mid-2012 - A7 at Amazon.com
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
parts-quick 8GB Memory for Apple MacBook Pro 13-inch and 15-inch (Mid 2012) DDR3L 1600MHz PC3L-12800 SODIMM Compatible RAM at Amazon.com