^[3] (页面存档备份,存于互联网档案馆) New Tactic In Terror: Beheading Of Hostages; Images On Internet Meant To Shock World, Win Recruits, Tim Collie, 24 June 2004, Sun Sentinel.
^[4] (页面存档备份,存于互联网档案馆) Terrorist Beheadings: Cultural and Strategic Implications, United States Department of the Air Force, RH Jones, 2005.
^[5] (页面存档备份,存于互联网档案馆) Where does the Islamic State's fetish with beheading people come from?
Terror group's tactics create fear out of all proportion to its military size, Shashank Joshi, 2 September 2014, Telegraph.
^[6] (页面存档备份,存于互联网档案馆) From Daniel Pearl to James Foley: The modern tactic of Islamist beheadings, Adam Taylor, 21 August 2014, Washington Post/Chicago Tribune.
^ 17.017.1[7] (页面存档备份,存于互联网档案馆) Islamic State steps up propaganda videos, beheading another captive, Videotaped atrocities in an attempt to spread fear are nothing new for IS. But it appears to be stepping up its propaganda as world powers start to engage in halting its spread, Dan Murphy, 29 August 2014, Christian Science Monitor.
^[8] (页面存档备份,存于互联网档案馆) Why Beheading Videos Are Back With ISIS, and Why They Went Away, Katie Zavadski, 21 August 2014, New York Magazine.