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→External Links
==External Links==
* [http://www.computinghistory.org.uk/det/22119/Alien-Addition/ Centre for Computing History: Alien Addition]
* [httphttps://www.elisoftware.org/w/index.php/Alien_Addition_(TI99%5C4A,_Cartridge)_Texas_Instruments_-_1981_USA,_Canada_Release Eli's Software Encyclopedia: Alien Addition]
* [https://gamefaqs.gamespot.com/ti99/224297-alien-addition GameFAQs: Alien Addition]
* [https://www.mobygames.com/game/ti-994a/alien-addition Moby Games: Alien Addition]
