Journal of Homeland Security and Emergency Management. Berlin, Boston: De Gruyter. Web. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/jhsem

Journal of Homeland Security and Emergency Management. Berlin, Boston: De Gruyter. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/jhsem

Journal of Homeland Security and Emergency Management. Berlin, Boston: De Gruyter. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/jhsem