However, Retail sales are still not allowed. [ 26 ] [ edit ] References ^ Valve Corporation : Counter-Strike version history. ^ "Counter-Strike on Steam" . Steam . Valve Corporation . http://store.steampowered.com/app/10/ . Retrieved 2012-04-01 .   ^ "Development a la mod"" . Red Herring (magazine) . 2001-05-08 . http://www.redherring.com/Home/3717 . Retrieved