Rigney, Ryan (11. juni 2013). «Even the Best Tower Defense Games Are Just Plain Boring». Wired. Arkivert fra originalen 16. april 2014. Besøkt 26. juli 2023. «It’s generally agreed upon that Atari’s 1990 arcade game Rampart was the first tower defense game, but the genre didn’t really catch on until about 2007, when Flash Element Tower Defense, Desktop Tower Defense and Bloons Tower Defense began dominating popular Flash game sites.»
wired.com
Rigney, Ryan (11. juni 2013). «Even the Best Tower Defense Games Are Just Plain Boring». Wired. Arkivert fra originalen 16. april 2014. Besøkt 26. juli 2023. «It’s generally agreed upon that Atari’s 1990 arcade game Rampart was the first tower defense game, but the genre didn’t really catch on until about 2007, when Flash Element Tower Defense, Desktop Tower Defense and Bloons Tower Defense began dominating popular Flash game sites.»