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… "Valve announces Source 2 engine, free for developers" . Polygon . Archived from the original on March 5, 2015 . Retrieved March 3, 2015 . ^ "Full Steam ahead: The History of Valve" . gamesradar . …
… Polygon . Archived from the original on July 16, 2021 . Retrieved July 15, 2021 . ^ a b Geblick, Jordan September 22, 2021 . "Valve answers all your burning Steam Deck questions in new FAQ" . …
… Polygon . Archived from the original on March 15, 2016 . Retrieved August 24, 2016 . ^ a b c Crecente, Brian May 5, 2016 . "Epic luminaries on why they left" . Polygon . …
… Polygon . Archived from the original on February 18, 2018 . Retrieved February 18, 2018 . ^ "Gabe Newell: 'Hooray! Valve's going to start shipping games again' " . …
… Polygon . …
… "Blizzard and Valve go to War Over DOTA Name" . Kotaku . Archived from the original on February 11, 2012. ^ Reilly, Jim May 11, 2012 . "Valve, Blizzard Reach DOTA Trademark Agreement" . …
… Polygon . …