ASIF, Usmani; C., Chung, Y.; L, Torero, Jose. How did the WTC towers collapse: a new theory. Edinburgh Research Archive. 2003-10. Dostupné online [cit. 2017-10-19]. (anglicky)
fema.gov
HAMBURGER, Ronald, et al. World Trade Center Building Performance Study [pdf]. Federal Emergency Management Agency [cit. 2006-07-27]. Dostupné online.
msn.com
msnbc.msn.com
Relatives gather at ground zero to mark 9/11 [online]. The Associated Press / MSNBC, 2007-09-09 [cit. 2007-11-03]. Dostupné online.
nist.gov
wtc.nist.gov
PartIIC – WTC 7 Collapse [pdf]. National Institute of Standards and Technology, 2005-04-05 [cit. 2006-11-01]. (NIST Response to the World Trade Center Disaster). Dostupné online.
NIST Response to the World Trade Center Disaster [PDF]. [cit. 2008-04-23]. Dostupné online.
washingtonpost.com
HAUGHNEY, Christine. Fireproofing Faulted in Trade Center Collapse [online]. 2002-06-25 [cit. 2017-11-11]. Dostupné online. (anglicky)Je zde použita šablona {{Cite web}} označená jako k „pouze dočasnému použití“.