Columbia subject headings:
September 11 Terrorist Attacks, 2001.
Terrorism--History--20th century.
Terrorism--History--21st century.
Terrorism--United States--History.
Terrorists--Biography.
Harvard subject headings:
Princeton subject headings:
Bin Laden, Osama, 1957-2011.
Case studies.
International relations.
September 11 Terrorist Attacks, 2001.
Terrorism--Case studies.
Terrorism--Religious aspects.