MacBook Pro | Core 2 Duo 2.53 GHz | 13 Inch | Mid 2009 - Techable.com
4GB RAM Memory (PC3-8500) for Apple MacBook 13 inch A1278 Late 2008, A1342 Late 2009, A1342 Mid 2010. Apple MacBook Pro 13 inch A1278 Mid 2009, A1278 Mid 2010, A1286 - Late 2008
MacBook (13-inch, Late 2009) - Technical Specifications
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com