Steam - 維基百科,自由的百科全書
^Steam Client Released. Valve Corporation. September 12, 2003 [February 3, 2008]. ^ Valve to Deliver Steam & Source on the Mac. Valve Corporation. 2010-08-03 [8 March 2010]. ^ Lee, James. The Last of the Independents?. GameIndustry.biz. 2008-4-30 [2011 .....