SPS 4521 / SCX4521 Black Toner Cartridge for Use in Samsung SCX-4521, SCX-4321F, SCX-4521F, SCX-4321 Single Color Toner (Black) : Amazon.in: Computers & Accessories
Samsung SCX-4521F Driver for Mac
Drsolutions-distribution : Samsung SCX-4x21 Series JC46-00251A
User manual Samsung SCX-4521F (English - 120 pages)