Steven D. Levitt; Stephen J. Dubner (2009). Superfreakonomics: global cooling, patriotic prostitutes, and why suicide bombers should buy life insurance. William Morrow. pp. 62, 231. ISBN978-0-06-088957-9. citing Alan B. Krueger, What Makes a Terrorist (Princeton University Press 2007); Claude Berrebi, „Evidence About the Link Between Education, Poverty, and Terrorism among Palestinians“, Princeton University Industrial Relations Section Working paper, 2003 and Krueger and Jita Maleckova, "Education, Poverty and Terrorism: Is There a Causal Connection? " Journal of Economic Perspectives 17 no. 4 (Fall 2003 / 63.
bbc.co.uk
news.bbc.co.uk
Sean Coughlan (21 August 2006). „Fear of the unknown“. BBC News. Nuoroda tikrinta 2010-01-11. „A passenger on the flight, Heath Schofield, explained the suspicions: "It was a return holiday flight, full of people in flip-flops and shorts. There were just two people in the whole crowd who looked like they didn't belong there."“
britannica.com
„Terrorism“. Encyclopædia Britannica. p. 3. Nuoroda tikrinta 2015-01-07.