XCOM (English Wikipedia)

"X-COM (Collector's Edition) for Windows (1998)". MobyGames. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"X-COM Collection for Windows (1999)". MobyGames. 2001-01-13. Archived from the original on 2017-07-01. Retrieved 2013-08-22.
"X-COM: Complete Pack for DOS (2008)". MobyGames. 2008-09-04. Archived from the original on 2013-10-29. Retrieved 2013-08-22.

moddb.com

"X-com - Last Hope mod for Half-Life 2". Mod DB. Archived from the original on 2013-10-29. Retrieved 2013-08-22.

ninex.info

ufotts.ninex.info

"UFO: The Two Sides". Ufotts.ninex.info. Archived from the original on 2011-10-12. Retrieved 2013-08-22.

nowgamer.com

"Interview With XCOM Creator Julian Gollop". Nowgamer.com. 2011-08-30. Archived from the original on 2013-02-05. Retrieved 2014-02-04.
"Interview With XCOM Creator Julian Gollop". NowGamer. 2011-08-30. Archived from the original on 2013-02-05. Retrieved 2013-08-22.

openapoc.org

"OpenApoc". openapoc.org. Retrieved 2019-05-07.

openxcom.org

"About". OpenXcom. Archived from the original on 2013-07-29. Retrieved 2013-08-22.

pcgamer.com

"OpenXCom renews the original UFO Defense as a valid option for terror | Mods, News". PC Gamer. 2013-10-25. Archived from the original on 2013-11-13. Retrieved 2013-11-14.
"GDC 2013: Original X-Com was nearly cancelled on two occasions | News". PC Gamer. 2013-03-29. Archived from the original on 2013-09-10. Retrieved 2013-08-22.

pcgamesn.com

Capel, Chris J (18 July 2021). "XCOM: Legends is real and is an official XCOM game". PCGamesN. Network N. Retrieved 22 February 2023.

pockettactics.com

"Julian Gollop: Sons of Rebelstar". Pocket Tactics. 2012-06-01. Archived from the original on 2013-08-27. Retrieved 2013-08-22.

polygon.com

Pitts, Russ (2013-01-31). "The Making of XCOM's Jake Solomon". Polygon. Archived from the original on 2014-02-09. Retrieved 2014-02-04.

projectxenocide.com

"News". Project Xenocide. Archived from the original on 2012-01-14. Retrieved 2013-08-22.

rockpapershotgun.com

Meer, Alec (16 April 2010). "Xenonauts: The X-COM Anti-Apocalypse?". Rock Paper Shotgun. Archived from the original on 2013-10-29. Retrieved 2013-08-22.

shacknews.com

Yurik, Poor. "Irrational Games Developing X-COM Title? - Video Game News, Videos and File Downloads for PC and Console Games at". Shacknews.com. Archived from the original on 2014-02-22. Retrieved 2014-02-04.

steamcommunity.com

"Isomer Steam forums discussion". October 20, 2016. Archived from the original on October 21, 2016.

steampowered.com

store.steampowered.com

"XCOM: Enemy Within on Steam". Store.steampowered.com. Archived from the original on 2013-12-15. Retrieved 2013-11-14.

strategycore.co.uk

comic.strategycore.co.uk

"Deep Rising comic - a tribute to X-Com". comic.strategycore.co.uk. Retrieved 2019-05-07.

terrygreer.com

"Terry Greer – Ghosts of games that never were". Terry Greer – Past work - XCOM Alliance. Archived from the original on 1 July 2017. Retrieved 26 August 2017.

ufo-game.ru

"UFO Online - News". Ufo-game.ru. Archived from the original on 2013-09-07. Retrieved 2013-08-22.

ufo2extraterrestrials.com

"UFO2Extraterrestrials: Battle for Mercury".
"Home". ufo2extraterrestrials.com.

unseen64.net

"Guardians: Agents of Justice (PC - Cancelled)". Unseen64: Beta, Cancelled & Unseen Videogames!. Unseen 64. 2010-06-06. Archived from the original on 2012-06-04. Retrieved 2013-08-22.

uspto.gov

assignments.uspto.gov

"USPTO Assignments on the Web". Assignments.uspto.gov. Archived from the original on 2015-03-17. Retrieved 2014-02-04.
"USPTO Assignments on the Web". Assignments.uspto.gov. Archived from the original on 2015-03-17. Retrieved 2014-02-04.

web.archive.org

Stapleton, Dan (1 June 2015). "XCOM 2 Announced -- IGN First". IGN. Archived from the original on 1 June 2015. Retrieved 1 June 2015.
"X-COM: UFO Defense Reviews". GameRankings. Archived from the original on March 12, 2011. Retrieved November 17, 2011.
"X-COM: UFO Defense Reviews". GameRankings. Archived from the original on October 21, 2010. Retrieved November 17, 2011.
"X-COM: Terror from the Deep Reviews". GameRankings. Archived from the original on November 28, 2011. Retrieved November 17, 2011.
"X-COM: Terror from the Deep Reviews". GameRankings. Archived from the original on November 7, 2011. Retrieved November 17, 2011.
"X-COM: Apocalypse Reviews". GameRankings. Archived from the original on November 7, 2011. Retrieved November 17, 2011.
"X-COM: Interceptor Reviews". GameRankings. Archived from the original on January 6, 2012. Retrieved November 17, 2011.
"GameSpy: Enemy Unknown: An X-COM Retrospective - Page 3". Uk.pc.gamespy.com. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"X-COM (Collector's Edition) for Windows (1998)". MobyGames. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"X-COM Collection for Windows (1999)". MobyGames. 2001-01-13. Archived from the original on 2017-07-01. Retrieved 2013-08-22.
"X-COM: Complete Pack for DOS (2008)". MobyGames. 2008-09-04. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"Terry Greer – Ghosts of games that never were". Terry Greer – Past work - XCOM Alliance. Archived from the original on 1 July 2017. Retrieved 26 August 2017.
"About". OpenXcom. Archived from the original on 2013-07-29. Retrieved 2013-08-22.
"OpenXCom renews the original UFO Defense as a valid option for terror | Mods, News". PC Gamer. 2013-10-25. Archived from the original on 2013-11-13. Retrieved 2013-11-14.
"XCOM: Enemy Unknown Reviews". Metacritic. Archived from the original on November 13, 2012. Retrieved October 21, 2012.
"XCOM: Enemy Unknown Reviews". Metacritic. Archived from the original on October 23, 2012. Retrieved October 21, 2012.
"XCOM: Enemy Unknown Reviews". Metacritic. Archived from the original on October 27, 2012. Retrieved October 21, 2012.
"The Bureau: XCOM Declassified Reviews". Metacritic. Archived from the original on August 22, 2013. Retrieved August 20, 2013.
"The Bureau: XCOM Declassified Reviews". Metacritic. Archived from the original on August 19, 2013. Retrieved August 20, 2013.
"The Bureau: XCOM Declassified Reviews". Metacritic. Archived from the original on August 20, 2013. Retrieved August 20, 2013.
"XCOM: Enemy Within Reviews". Metacritic. Archived from the original on September 19, 2015. Retrieved September 11, 2015.
"XCOM: Enemy Within Reviews". Metacritic. Archived from the original on December 29, 2017. Retrieved September 11, 2015.
"XCOM: Enemy Within Reviews". Metacritic. Archived from the original on December 29, 2017. Retrieved September 11, 2015.
"XCOM: Enemy Within Reviews". Metacritic. Archived from the original on August 29, 2015. Retrieved September 11, 2015.
"XCOM 2 for PC Reviews". Metacritic. Archived from the original on February 4, 2016. Retrieved February 4, 2016.
"XCOM 2 for PlayStation 4 Reviews". Metacritic. Archived from the original on June 30, 2016. Retrieved February 4, 2016.
"XCOM 2 for Xbox One Reviews". Metacritic. Archived from the original on June 18, 2016. Retrieved February 4, 2016.
"XCOM: Chimera Squad for PC Reviews". Metacritic. Archived from the original on June 28, 2020. Retrieved July 1, 2020.
"(official 2K Marin site)". XCOM. Archived from the original on 2012-02-22. Retrieved 2012-01-01.
"GDC 2013: Original X-Com was nearly cancelled on two occasions | News". PC Gamer. 2013-03-29. Archived from the original on 2013-09-10. Retrieved 2013-08-22.
"Enemy Within". XCOM. Archived from the original on 2013-11-11. Retrieved 2013-11-14.
"XCOM: Enemy Within on Steam". Store.steampowered.com. Archived from the original on 2013-12-15. Retrieved 2013-11-14.
"XCom UFO creators strategy game Laser Squad Nemesis". Codo Technologies. Archived from the original on 2009-03-08. Retrieved 2007-11-26.
"Julian Gollop's new game will be a cross between old and new XCOM". mcvuk.com. 2016-04-27. Archived from the original on 2016-07-06. Retrieved 2017-06-14.
"XCOM.com | XCOM 2: Resurrection Bridges the Gap Between XCOM: Enemy Unknown and XCOM 2". Archived from the original on 2016-07-31. Retrieved 2015-09-20.
"UFOs Sighted!". Fantasy Flight Games. 28 January 2015. Archived from the original on 31 January 2015. Retrieved 28 January 2015.
"Interview With XCOM Creator Julian Gollop". Nowgamer.com. 2011-08-30. Archived from the original on 2013-02-05. Retrieved 2014-02-04.
"USPTO Assignments on the Web". Assignments.uspto.gov. Archived from the original on 2015-03-17. Retrieved 2014-02-04.
"USPTO Assignments on the Web". Assignments.uspto.gov. Archived from the original on 2015-03-17. Retrieved 2014-02-04.
Yurik, Poor. "Irrational Games Developing X-COM Title? - Video Game News, Videos and File Downloads for PC and Console Games at". Shacknews.com. Archived from the original on 2014-02-22. Retrieved 2014-02-04.
Pitts, Russ (2013-01-31). "The Making of XCOM's Jake Solomon". Polygon. Archived from the original on 2014-02-09. Retrieved 2014-02-04.
Meer, Alec (16 April 2010). "Xenonauts: The X-COM Anti-Apocalypse?". Rock Paper Shotgun. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"Julian Gollop: Sons of Rebelstar". Pocket Tactics. 2012-06-01. Archived from the original on 2013-08-27. Retrieved 2013-08-22.
"Abomination: The Nemesis Project - ESCMag Review". Escmag.com. 1999-12-15. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"Aliens versus Humans / retro iPhone game". Aliensvshumansapp.com. Archived from the original on 2013-09-04. Retrieved 2013-08-22.
Classic Games Postmortem - XCOM: UFO Defense Archived 2014-11-03 at the Wayback Machine, presentation of Julian Gollop on the GDC, March 28, 2013 (GameSpot).
"Guardians: Agents of Justice (PC - Cancelled)". Unseen64: Beta, Cancelled & Unseen Videogames!. Unseen 64. 2010-06-06. Archived from the original on 2012-06-04. Retrieved 2013-08-22.
"Curse of the Superheroes? - IGN". Uk.ign.com. 25 August 2000. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"Incubation Reviews". Blue Byte. Archived from the original on 2011-01-09. Retrieved 2010-06-23.
"Isomer Steam forums discussion". October 20, 2016. Archived from the original on October 21, 2016.
"Isomer the alphafunded XCOM-like indie game". ionisingsoftware.co.uk. Archived from the original on 2014-06-25. Retrieved 2014-06-12.
"UFO Online - News". Ufo-game.ru. Archived from the original on 2013-09-07. Retrieved 2013-08-22.
"UFO Online – Fight for Earth website". Ufo-online.gamigo.com. Archived from the original on 2012-03-02. Retrieved 2013-08-22.
"Julian Gollop on XCOM - Edge Magazine". Edge-online.com. Archived from the original on 2012-03-26. Retrieved 2013-08-22.
Yoon, Andrew. "Xenonauts capitalizes on XCOM rage". Joystiq. Archived from the original on 2015-02-12.
Michael E. Ryan, Civ II: Fantastic Worlds Review Archived December 29, 2011, at the Wayback Machine, GameSpot, December 18, 1997
"X-com - Last Hope mod for Half-Life 2". Mod DB. Archived from the original on 2013-10-29. Retrieved 2013-08-22.
"UFO: The Two Sides". Ufotts.ninex.info. Archived from the original on 2011-10-12. Retrieved 2013-08-22.
"UFO: Cydonia's Fall - Temporary Site". 2012-04-12. Archived from the original on 2012-04-12. Retrieved 2019-05-07.
"X-COM: Origin". Xcomorigin.com. 2012-02-15. Archived from the original on 2013-07-18. Retrieved 2013-08-22.
Arne Niklas Jansson (2012-04-17). "PSG RebelSquad". Archived from the original on 2012-04-17. Retrieved 2013-08-22.
Christian Reich (2011-08-31). "X-Force: Fight For Destiny - Home". Xforce-online.de. Archived from the original on 2013-07-19. Retrieved 2013-08-22.
"News". Project Xenocide. Archived from the original on 2012-01-14. Retrieved 2013-08-22.
"Official Xenowar website". Xenowar.net. Archived from the original on 2013-09-04. Retrieved 2013-08-22.
"X-Com: Tactical | Board Game". BoardGameGeek. Archived from the original on 2012-03-31. Retrieved 2013-08-22.
"Interview With XCOM Creator Julian Gollop". NowGamer. 2011-08-30. Archived from the original on 2013-02-05. Retrieved 2013-08-22.

xcom.com

"(official 2K Marin site)". XCOM. Archived from the original on 2012-02-22. Retrieved 2012-01-01.
"Enemy Within". XCOM. Archived from the original on 2013-11-11. Retrieved 2013-11-14.
"XCOM.com | XCOM 2: Resurrection Bridges the Gap Between XCOM: Enemy Unknown and XCOM 2". Archived from the original on 2016-07-31. Retrieved 2015-09-20.

xcomorigin.com

"X-COM: Origin". Xcomorigin.com. 2012-02-15. Archived from the original on 2013-07-18. Retrieved 2013-08-22.

xenowar.net

"Official Xenowar website". Xenowar.net. Archived from the original on 2013-09-04. Retrieved 2013-08-22.

xforce-online.de

Christian Reich (2011-08-31). "X-Force: Fight For Destiny - Home". Xforce-online.de. Archived from the original on 2013-07-19. Retrieved 2013-08-22.

youtube.com

Classic Games Postmortem - XCOM: UFO Defense Archived 2014-11-03 at the Wayback Machine, presentation of Julian Gollop on the GDC, March 28, 2013 (GameSpot).