1. WHO. Biological Weapon. www.who.int/health-topics/biological-weapons/
2. NIAID Emerging Infectious Diseases/Pathogens. www.niaid.nih.gov/research/emerging-infectious-diseases-pathogens
3. US Centers for Disease Control and Prevention. Preparation and Planning for Bioterrorism Emergencies. https://emergency.cdc.gov/bioterrorism/prep.asp
4. US Federal Bureau of Investigation. Amerithrax or Anthrax Investigation. www.fbi.gov/history/famous-cases/amerithrax-or-anthrax-investigation