Eldridge, Thomas R.; Ginsburg, Susan; Hempel II, Walter T.; Kephart, Janice L.; Moore, Kelly (2004). Accolla, Joanne M.; Falk, Alice (eds.). "Staff Monograph on 9/11 and Terrorist Travel"(PDF). 9/11 Commission. p. 233. Archived(PDF) from the original on 9 October 2022. Retrieved 7 December 2018.
"Chapter 7.3–The Attack Looms, Assembling the Teams". 9/11 Commission Report. National Commission on Terrorist Attacks Upon the United States. pp. 231–240. Archived from the original on 23 October 2013. Retrieved 30 September 2008.
Eldridge, Thomas R.; Ginsburg, Susan; Hempel II, Walter T.; Kephart, Janice L.; Moore, Kelly (2004). Accolla, Joanne M.; Falk, Alice (eds.). "Staff Monograph on 9/11 and Terrorist Travel"(PDF). 9/11 Commission. p. 233. Archived(PDF) from the original on 9 October 2022. Retrieved 7 December 2018.
"Chapter 7.3–The Attack Looms, Assembling the Teams". 9/11 Commission Report. National Commission on Terrorist Attacks Upon the United States. pp. 231–240. Archived from the original on 23 October 2013. Retrieved 30 September 2008.