6Brigitte L N, Yaeli B E, Robert Y S. Post-9/11 Terrorism Threats, News Coverage, and Public Perceptions in the United States[J]. International Journal of Conflict and Violence, 2007, 1 (2): 106.
7National Strategy for Combating Terrorism[DB/OL]. http://www.whitehouse.gov/nsc/nsct/2006/nsct2006.pdf.
8IPU Document, No18(113th IPU Assembly)[R]. 19 October 2005: 2-5.
9Geoff D. Protecting passenger transport systems from the threat of terrorism[J]. Public Transport International, 2006(1): 10.
10Countering International Terrorism: The United Kingdom's Strategy[R]. London: The Stationery Office, July 2006: 33.