Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
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
How to Upgrade RAM on MacBook Pro and Other Macs
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
How to Upgrade the RAM in Your MacBook Pro
M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac
MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide