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
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How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
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Macbook Pro RAM Upgrade Kit 8GB 2 x 4GB 2011 2012 A1278 A1286 13 15" 10600s DDR3 836905536579 | eBay
Macbook Pro RAM Upgrade Kit- 8GB (2 x 4GB) for 2011 2012 A1278 A1286 13 15" inch | eBay
Apple MacBook Pro Early 2011 Crucial Memory Upgrade - YouTube
How to Upgrade RAM in MacBook Pro 17" 2011 16GB Install Tutorial - YouTube
Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) RAM Upgrade : Electronics
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
MacBook Pro RAM Memory Upgrade
Ram upgrade on Macbook Pro 13 Early 2011 | MacRumors Forums