Glasser, MS, CPP, CEM, CHS-V, MCAS, M. “Do FEMA’s, HSEEP’s, and Green’s Progressively Difficult Emergency Exercise Training Concepts Ultimately Lead to Increased Emergency Preparedness?”. Journal of Emergency Management, vol. 7, no. 5, Sept. 2009, pp. 33-38, doi:10.5055/jem.2009.0019.