Frederick S. (Threat Management Consultant, Arlington, Virginia, USA) Calhoun & J.D., Stephen W. (California Highway Patrol (Retired), Sacramento, USA) Weston 
Threat Assessment and Management Strategies [PDF ebook] 
Identifying the Howlers and Hunters, Second Edition

The field of threat assessment and the research surrounding it have exploded since the first edition of Threat Assessment and Management Strategies: Identifying the Howlers and Hunters. To reflect those changes, this second edition contains more than 100 new pages of material, including several new chapters, charts, and illustrations, as well as up