Hackaday - "Pictorial Guide to the Unofficial Badges of DEF CON 27"
https://hackaday.com/2019/09/19/pictorial-guide-to-the-unofficial-electronic-badges-of-def-con-27/
9/19/2019
Hackaday - "AFTER THE CON: DA BOMB BADGE POST MORTEM"
https://hackaday.com/2019/09/02/after-the-con-da-bomb-badge-post-mortem/
9/2/2019
Malwarebytes Labs - "DEF CON 27 retrospective: badge life redux"
https://blog.malwarebytes.com/researchers-corner/2019/08/def-con-27-retrospective-badge-life-redux/
8/20/2019
The Parallax - "Trump’s tariffs just about killed DefCon #badgelife"
https://the-parallax.com/2019/08/08/defcon-trump-tariffs-badges/
8/8/2019
White Ops Threat Intel Blog
https://www.whiteops.com/blog/threat-intel-at-defcon-27
Unknown Date, Possibly August 2019