Preventing Assassination: A MonographFein, R., & Vossekuil, B. (1997, May). Preventing Assassination: A Monograph. Secret Service Exceptional Case Study Project. U.S. Secret Service, National Institute of Justice.
Review chapters 1-3 (pages 5-12) and chapters 7-11 (pages 45-85). This seminal work researched commonalities in stalking cases of public figures and is the basis for much in the field of risk and threat assessment today.