Steve Coll, Ghost Wars (2005 edn), pp. 137–46, 527–8; 9/11 Commission Report, chapter 3, pp. 75, 92 (HTML version). The "explosive drones" are from Coll's interview with Clarridge, Dec. 28, 2001: Ghost Wars, p. 685, note 3.
Coll, Ghost Wars, pp. 436–7, and p. 646 note 42; 9/11 Commission Report, chapter 11, p. 357 (HTML version).
Tenet, At the Center of the Storm, pp. 164–65. The conversation is a virtual replica of that given in Bob Woodward, Bush at War (2002/3) (Publisher's extract from chapter 1).