MacBook Pro (13-inch, Mid 2012) Hard Drive (and possibly RAM) replacement : r/mac
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
How to make your MacBook Pro faster – upgrading a MacBook Pro mid-2012 to SSD and more RAM memory - Webdesign Blog by Andreas Stricker
OWC - 8GB OWC Memory Upgrade Kit - 2 x 4GB PC12800 DDR3L 1600MHz SO-DIMMs for 2011-2015 iMac, 2011-12 Mac mini, and 2011-2012 MacBook Pro (non-Retina display) models : Amazon.co.uk: Computers & Accessories
How to Upgrade a Mid 2012 15" MacBook Pro - New RAM - New SSD! - YouTube
OFFTEK 4GB Replacement Memory RAM Upgrade for Apple MacBook Pro 2.5GHz Intel Core i5 - (13-inch) (DDR3) (Mid-2012) (DDR3-12800) Laptop Memory: Amazon.co.uk: Computers & Accessories
Timetec Hynix IC 8GB Compatible for Apple DDR3L 1600MHz PC3L-12800 SODIMM Memory Upgrade for Early/Mid/Late 2011, Mid/Late 2012, Early/Late 2013, Late 2014, Mid 2015 MacBook Pro, iMac, Mac Mini (8GB) : Amazon.co.uk: