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2. John Hanke and Patricia Geiger 2017 "Reality as Virtual Playground" Making Games http://www.makinggames.biz/features/reality -as-a-virtual-playground7286.html Retrieved 9/9/2017. John Hanke and Patricia Geiger 2017 "Reality as Virtual Playground" Making Games http://www.makinggames.biz/features/reality -as-a-virtual-playground7286.html Retrieved 9/9/2017.
3. Invader 2017 "About Invader " http://www.space-invaders.com/about/ Retrieved 9/9/2017. Invader 2017 "About Invader " http://www.space-invaders.com/about/ Retrieved 9/9/2017.