Chronology of Significant International Terrorist Incidents - NCTC Country Reports on Terrorism 2005 Statistical Annex - U.S. State Department Country Reports on Terrorism, U.S. Department of State Terror threat to U.S. called 'significant' - CNN
گزارش آمریکا درباره تروریسم در ۲۰۱۶ Chronology of Significant International Terrorist Incidents - NCTC Country Reports on Terrorism 2005 Statistical Annex - U.S. State Department Country Reports on Terrorism, U.S. Department of State Terror threat to U.S. called 'significant' - CNN مشارکت‌کنندگان ویکی‌پدیا.