How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
A-Tech 8GB (2 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for MacBook, MacBook Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) | 204-Pin SODIMM Memory Kit at Amazon.com
A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
MacBook Pro - Wikipedia
Apple MacBook 13" A1342 2.26GHz Intel Core 2 Duo 4GB RAM 120GB SSD Late 2009 | eBay
MacBook Pro: How to remove or install memory - Apple Support
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core 2 Duo 2.8 17" Mid-2009 - A35 at Amazon.com
Refurbished | Apple MacBook Pro Laptop | 13.3-inch | 4GB RAM | Mac OS | 500GB HDD | Bundle: Black Case, Wireless Mouse, Bluetooth/Wireless Airbuds By Certified 2 Day Express - Walmart.com