The MacBook Pro Review (13 & 15-inch): 2011 Brings Sandy Bridge
MacBook Pro: How to remove or install memory - Apple Support
Apple Adds Early 2011 13-Inch MacBook Pro to Obsolete Products List - MacRumors
Memory RAM Upgrade for Apple MacBook Pro 13-inch Early 2011 4GB DDR3 SODIMM | eBay
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
Guía: Especial memoria RAM para Mac
MacBook Pro 13" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
How To: MacBook Pro Late 2011 Memory Upgrade - 16GB (2 X 8GB) : 6 Steps - Instructables
MacBook Pro 13" Unibody Late 2011 RAM Replacement - iFixit Repair Guide
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com