I'd give THINKING LIKE A TERRORIST: Insights of a Former FBI Undercover Agent by Mike German - a miss - disappointed was I.

Replace with: 'Inside the Jihad' by Omar Nasiri (2006) and 'Rebel Hearts' by Kevin Toolis (1996).

Surely 'The Looming Tower' by Lawrence Wright, without doubt the best AQ background read?

Try 'Terrorism: How to respond' by Richard English and 'The Psychology of Counter-Terrorism' Edited by Andrew Silke.

Finally Alistair Horne's book 'A Savage War of Peace' and Professor R.V. Jones books on scientific intelligence.

Try to avoid an Anglo-US centric viewpoint, read on conflicts where neither party was involved and avoid too many contemporary conflicts. There is much to learn from history. I am sure a similar RFI on a French / Spanish / Russian speaking blog would be quite different.