A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
MacBook Pro 13" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
MacBook Pro Early 2011, Upgrade della RAM | The Apple Lounge
How to Upgrade RAM in MacBook Pro 17" 2011 16GB Install Tutorial - YouTube
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com