Defender (1981 video game) (English Wikipedia)

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Cuciz, David (May 2001). "Hall of Fame: Defender". GameSpy. Archived from the original on January 12, 2005. Retrieved December 6, 2009.
""Donkey Kong" No.1 Of '81 — Game Machine's Survey Of "The Year's Best Three AM Machines" —" (PDF). Game Machine. No. 182. Amusement Press, Inc. February 15, 1982. p. 30. Archived (PDF) from the original on January 31, 2020.
"Complete Games Guide" (PDF). Computer and Video Games (Complete Guide to Consoles): 46–77. October 16, 1989. Archived (PDF) from the original on January 5, 2021.
"Top 100 Games of All Time" (PDF). GamesMaster (44): 78. July 1996. Archived (PDF) from the original on December 11, 2021.
"The Greatest Games of All Time: Defender". GameSpot. Archived from the original on October 8, 2007.
Retro Gamer Staff (September 2008). "Top 25 Arcade Games" (PDF). Retro Gamer. No. 54. Imagine Publishing. p. 68. Archived from the original (PDF) on February 1, 2014.
"Defender High Score Rankings". Twin Galaxies. Archived from the original on February 16, 2008. Retrieved October 26, 2009.
"Join Guinness World Records for Four Days of Classic Game Record-Breaking Mayhem" (Press release). Funspot Family Entertainment Center. May 27, 2008. Archived from the original on June 4, 2011. Retrieved October 28, 2009.
"RickSmith". robotron2084guidebook.com. September 4, 2014. Archived from the original on April 13, 2018. Retrieved April 12, 2018.
Whitehead, Jim (January 29, 2007). "Game Genres: Shmups" (PDF). University of California, Santa Cruz. Archived from the original (PDF) on June 29, 2011. Retrieved December 6, 2009.
Loguidice, Bill; Matt Barton (August 4, 2009). "The History of Robotron: 2084 - Running Away While Defending Humanoids". Gamasutra. Archived from the original on August 7, 2009. Retrieved October 15, 2009.
IGN Staff (July 24, 2007). "Top 10 Tuesday: Game Designers". IGN. Archived from the original on September 28, 2011. Retrieved March 16, 2009.

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"Coin Machine: Chicago Chatter" (PDF). Cashbox. March 7, 1981. p. 40. Archived (PDF) from the original on July 28, 2020.

Defender (1981 video game) (English Wikipedia)

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