How to Install Memory in a 13-inch MacBook Pro (Mid 2012) MacBookPro9,2 - YouTube
MacBook Pro 13" Unibody A1278 (Mid 2012) RAM Upgrade Kit
Apple MacBook Pro 9,2 - 2012 13" A1278 - i5-3210m @ 2.50GHz 4GB RAM 256GB SSD | eBay
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A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
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Apple MacBook Pro 9,2 A1278 13.3"... - Q & J Online Shop | Facebook
16GB 2x 8GB DDR3 1600MHz PC3-12800 sodimm RAM for Apple MacBook Pro (Mid 2012) | eBay
Apple MacBook Pro 9,2 13" Mid 2012 A1278 Intel i5 3210M 2.5GHz 4GB 256GB SSD | eBay
Apple MacBook Pro 9,2 - 2012 13" A1278 - i5-3210m @ 2.50GHz 4GB RAM 500GB HDD | eBay