3Jonathan R White: Terrorism: An Introduction, 1991, see http://polisci. home. mindspring. com/ptd- difinition.
4Alex P. Schmid, Albert J. Jongman et al., Political Terrorism: A New Guide to Actors, Authors, Concepts, Data Bases, Theories, and Literature. New Brunswick, Transaction Books, 1988, pp. 5～6.
5Michard Allan, "Terrorism, Extradition & International Sanctions", "Symposium on Terrorism and Security Aboard International Airlines", Albany Law Journal of Science and Technology, 1993.
6Beau Grosscup: The newest Explosions of Terrorism, p. 1, 1998 published by New Herizon Press.
7Bruce Hoffman: Inside Terrorism, First published in Great Britain 1998 by Victor Gollancz.
