Apple MacBook Pro 13-inch (500GB HDD, Early 2011) 2.3 GHz Intel Core i5, 4GB Ram | eBay
How To: MacBook Pro Late 2011 Memory Upgrade - 16GB (2 X 8GB) : 6 Steps - Instructables
Apple Macbook Pro 13 inch Early 2011 2.3 GHz Intel Core i5 4GB RAM 320GB SATA | eBay
Apple MacBook Pro 13.3" Intel Core i5 4GB RAM 500GB Hard Drive (MD313LL/A) Late 2011 (Certified Refurbished) Silver A1278 - Best Buy
Apple MacBook Pro 13-Inch (Early 2011) i5 2.30GHz 4GB RAM 320GB HHD macOS Sierra | eBay
macos - What is the maximum amount of RAM a 2011 MacBook Pro can utilize? - Ask Different
Apple MacBook Pro 13-inch Early 2011 - Silver (Refurbished) – eDubaicart
Apple MacBook Pro (13-inch, Late 2011)(2.4 GHz Intel Core i5 240GB SSD 8GB Ram) | eBay
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
MacBook Pro 13" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) RAM Upgrade : Electronics
Amazon.com: Apple MacBook Pro MD101LL/A - 13.3-inch Laptop - Intel Core i5 2.5GHz, 4GB RAM, 128GB HDD (Renewed) : Electronics
Display Quality & Peripherals - Apple 15-inch MacBook Pro (Late 2011) Review
macos - What is the maximum amount of RAM a 2011 MacBook Pro can utilize? - Ask Different
MacBook Pro 13" (Late 2011) 1600MHz Ram - Apple Community
Apple MacBook Pro 13 (Early 2011) review: Apple MacBook Pro 13 (Early 2011) - CNET