Sternberg, Ernest and George C Lee. "Meeting the Challenge of Facility Protection for Homeland Security" Journal of Homeland Security and Emergency Management, 3.1 (2006): -. Retrieved 24 May. 2013, from doi:10.2202/1547-7355.1153

Sternberg, E. & Lee, G. (2006). Meeting the Challenge of Facility Protection for Homeland Security. Journal of Homeland Security and Emergency Management, 3(1), pp. -. Retrieved 24 May. 2013, from doi:10.2202/1547-7355.1153

Sternberg, Ernest and George C Lee. 2006. Meeting the Challenge of Facility Protection for Homeland Security. Journal of Homeland Security and Emergency Management. 3(1): -. Retrieved 24 May. 2013, from doi:10.2202/1547-7355.1153