Read Chapt. 4 of the Tibi book, Chapt. 5 of the Aaron book; and Chapt. 3 of the Phares book.
Tibi, Bassam (2012) Islamism and Islam, Yale University Press, New Haven & London And Aaron, David (2008) In Their Own Words, Voices of Jihad, Rand: Santa Monica, California and Phares, Walid (2005) Future Jihad, Terrorist Strategies Against the West, Palgrave, Macmillan