website|http://web.archive.org/web/20100218135937/http://eludevisibility.org/the-firemen-usa-beta/|Original release on Eludevisibility.org (archive)|
website|http://www.digitpress.com/forum/showthread.php?98330|Thread on Digital Press on DuoFan's initial find of the prototype|
website|http://www.digitpress.com/forum/showthread.php?62141/page57|Thread on DP stating that DuoFan was selling the prototype on Ebay, but the auction was pulled|