ASIS International, Houses of Worship Committee: Jim McGuffey, MA, CPP, PSP, PCI; Paula L. Ratliff, BSC, MS; Doug Meacham, CRM; Phil Purpura, CPP Dick Raisler; Carl Chinn; Alistair Calton; Recommended Best Practices for Securing Houses of Worship Around the World (2017)

FEMA Guide for Developing High-Quality Emergency Operations Plans for Houses of Worship (June 2013)

International Association of Chiefs of Police, article Advising Houses of Worship on a Comprehensive and Balanced Security Plan By William S. Carcara, Chief of Police (Retired), Jefferson County, Kentucky

The National Disaster Interfaiths Network, Active Shooter in a House of Worship tip sheet

The National Church Arson Task Force, Threat Assessment Guide for Houses of Worship (2000)