Why Patriots Became Siege - Investigating Rainbow 6: Patriots
The Develop Post-Mortem: Rainbow Six Siege - MCV/DEVELOP
Ubisoft Confirms Rainbow 6 Patriots in Development - GameRevolution
Whatever Happened To Tom Clancy's Rainbow 6: Patriots?
Ubisoft announces Rainbow 6: Siege, official announcement, trailer and details
Rainbow Six: Patriots will 'surprise the industry', next-gen likely - Ubisoft
Tom Clancy's Rainbow Six: Vegas 2 Windows, X360, PS3 game - Mod DB
Rainbow Six: Patriots was not good enough, so Ubisoft started over - GameSpot
Concept art from cancelled r6 Patriots game, i like to think this is the chalet map before they remade the game into siege. : r/Rainbow6
Potential Title Revealed for 'Rainbow Six' Sequel