Taylor, Peter (27. 5. 2015). „The World's Richest Terror Army”. BBC. „Beheadings and mass slaughter are the hallmark of IS – whole villages massacred, women cast into slavery. But this butchery is not random. It is callous and calculated, as former British intelligence officer Alastair Crooke points out: They in fact in some ways copy Genghis Khan and the Mongol approach to military conquest. You create an absolute fear deliberately in your enemies, and the first time you come to a village you kill everyone, the dogs, the cats, everything. Destroy it down to the ground.”
