Amazon.com: Apple MacBook Pro (15-Inch, 16GB RAM, 256GB Storage, 2.2GHz Intel Core i7) - Space Gray (Previous Model) : Electronics
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
4GB Ram Memory (PC3L-12800, DDR3 1600MHz) for Apple MacBook Pro 15 inch A1286, 13 inch A1278 . iMac 21.5 inch A1418 , 27 inch A1419 , Mac Mini A1347 ( Mid 2012 - Mid 2015) - MacWave
15" 15 Inch Retina MacBook Pro A1398 Mid 2015 Complete Disassembly (Almost) SSD Upgrade - YouTube
15-inch MacBook Pro Mid 2009 Memory Installation Video - YouTube
15-inch MacBook Pro Late 2008 Memory Installation Video - YouTube