Columbia subject headings:
Executives--Crimes against.
Extortion.
Hostage negotiations.
Kidnapping.
Ransom.
Terrorism--Prevention.
Terrorists.
Harvard subject headings:
Executives--Crimes against
Extortion.
Hostage negotiations.
Kidnapping
Ransom.
Terrorism--Prevention
Terrorists.
Princeton subject headings:
Executives--Crimes against.
Extortion.
Hostage negotiations.
Kidnapping.
Ransom.
Terrorism--Prevention.
Terrorists.