16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
MacBook Pro: How to remove or install memory - Apple Support
My 2011 MacBook Pro with Big Sur! With an SSD and more RAM, this does not feel it's age. : r/mac
Apple MacBook Pro A1278 Early-2011 13" Intel Core i5 @ 2.3GHz 12GB RAM 1TB HDD | eBay
A-Tech 8GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com