MacBook Pro: how to remove or install memory – Apple Support (UK)
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A-Tech for Apple 16GB Memory Ram Kit 2x 8GB PC3-12800 1600MHz Macbook Pro 13 -inch/15-inch Mid 2012 iMac 21.5 inch Late 2012 Early Late 2013 Late 2014 Mid 2015 Mac Mini Late 2012
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
Apple MacBook Pro 13in A1278 (Mid 2012) - Core i7-3520M 2.9GHz CPU - 8GB RAM - 750GB HDD - 13in High Resolution Screen - WIFI - Bluetooth - Sierra (Renewed) : Amazon.co.uk: Computers & Accessories
Apple MacBook Pro 13" Mid 2012 A1278 Core i5 2.5GHz 8GB RAM 1TB SSD | eBay