HP ProBook 4520s Laptop- 320GB HDD, 4GB RAM, Intel i3-380M CPU, Window – Buffalo Computer Parts
Open Box: HP Laptop ProBook Intel Core i5 1st Gen 480M (2.66GHz) 4GB Memory 320GB HDD Intel HD Graphics 15.6" Windows 7 Professional 64-bit 4520s (XT990UT#ABA) - Newegg.com
HP PROBOOK 4520S LAPTOP i3 M 350 2.27GHZ 2GB RAM 300GB HDD WINDOWS 10 | eBay
Review of HP Probook 4520s | Tech Tips n Reviews
HP ProBook 4520s - Notebookcheck.net External Reviews