MacBook Pro: How to remove or install memory - Apple Support
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
2012 Macbook Pro 15" A1286 RAM Upgrade - YouTube
memory - 16GB 1600mhz vs 16GB 1866mhz RAM for Macbook Pro 13" mid 2012 - Ask Different