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Sinclair, Brendan (2008-04-15). "IV Premium Edition Details at GameSpot". Gamespot.com. Retrieved 2013-12-21.
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"Soulcalibur IV Goes Online at 1UP.com". Archived from the original on 2007-09-27.
"Revenant". Archived from the original on 2014-10-31. Retrieved 2013-12-21.
"Frederick Schtauffen". Archived from the original on 2012-02-24. Retrieved 2013-12-21.
""Soulcalibur IV Character Spotlight: Siegfried" via". 1up.com. 2008-07-29. Retrieved 2013-12-21.
Sinclair, Brendan (2008-04-15). "IV Premium Edition Details at GameSpot". Gamespot.com. Retrieved 2013-12-21.
"Soulcalibur IV Gets DLC at 1UP.com". Archived from the original on 2008-08-09. Retrieved 2008-08-08.
Plunkett, Luke (20 October 2010). "Vader, Yoda Cross Soul Calibur IV Versions On October 23". Kotaku. Gizmodo Media Group. Archived from the original on 3 November 2018. Retrieved 3 November 2018.
"Joystiq.com Soulcalibur IV getting Vader and Yoda DLC". Archived from the original on 2008-10-21. Retrieved 2008-10-18.
"SoulCalibur IV for PlayStation 3 - GameRankings". www.gamerankings.com. Archived from the original on 2017-01-09. Retrieved 2017-01-08.