"Chapter 1.1 - "We Have Some Planes", Inside the Four Flights". 9/11 Commission Report. National Commission on Terrorist Attacks Upon the United States. 2004. Archived from the original on 2008-05-11. Retrieved 2008-09-30.
Lawson, J. Randall, Robert L. Vettori (September 2005). "NIST NCSTAR 1-8 - The Emergency Response"(PDF). National Institute of Standards and Technology. p. 37. Archived(PDF) from the original on 2008-10-05. Retrieved 2008-10-05.{{cite web}}: نگهداری یادکرد:نامهای متعدد:فهرست نویسندگان (link)
"Chapter 1.1 - "We Have Some Planes", Inside the Four Flights". 9/11 Commission Report. National Commission on Terrorist Attacks Upon the United States. 2004. Archived from the original on 2008-05-11. Retrieved 2008-09-30.
Lawson, J. Randall, Robert L. Vettori (September 2005). "NIST NCSTAR 1-8 - The Emergency Response"(PDF). National Institute of Standards and Technology. p. 37. Archived(PDF) from the original on 2008-10-05. Retrieved 2008-10-05.{{cite web}}: نگهداری یادکرد:نامهای متعدد:فهرست نویسندگان (link)