How To: Install RAM in Macbook Pro (Unibody - 2009 to 2011) - YouTube
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM : Electronics
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
Adamanta 16GB (2x8GB) Memory Upgrade Compatible for Apple Mid 2010, Early 2011, Mid 2011, Late 2011 iMac, MacBook Pro, Mac Mini DDR3 1333Mhz PC3-10600 SODIMM 2Rx8 CL9 1.5v Module RAM at Amazon.com
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OWC 24GB (2 x 4GB + 2 x 8GB) PC10600 DDR3 1333MHz SO-DIMMs Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S24S) at Amazon.com
8GB (2x 4GB) Apple MacBook Pro 13"/15" Early 2011 / Late 2011 DDR3 Laptop Memory | eBay
16GB (2X8GB) SODIMM RAM Memory for Apple MacBook Pro Core i5 2.3 13" Early 2011 DDR3-10600 1333Mhz by Xtremeram at Amazon.com
How to boost your MacBook Pro performance | ZDNET
Macbook Pro RAM Upgrade Kit 8GB 2 x 4GB 2011 2012 A1278 A1286 13 15" 10600s DDR3 836905536579 | eBay
8GB RAM Upgrade for 2011 MacBook Pro & Mac Mini Core i5 & i7 – $34 | OSXDaily
MacBook Pro 15" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
MacBook Pro: How to remove or install memory - Apple Support