Hansen, Randy R. "Letter to the Editor Regarding Incident Command System (ICS)" Journal of Homeland Security and Emergency Management, 3.4 (2006): -. Retrieved 21 May. 2013, from doi:10.2202/1547-7355.1289

Hansen, R. (2006). Letter to the Editor Regarding Incident Command System (ICS). Journal of Homeland Security and Emergency Management, 3(4), pp. -. Retrieved 21 May. 2013, from doi:10.2202/1547-7355.1289

Hansen, Randy R. 2006. Letter to the Editor Regarding Incident Command System (ICS). Journal of Homeland Security and Emergency Management. 3(4): -. Retrieved 21 May. 2013, from doi:10.2202/1547-7355.1289