9/11 Investigation (PENTTBOM)Federal Bureau of Investigation. September 2001. United States Department of Justice. Arkistoitu toukokuu 14, 2008. Viitattu May 22, 2008.
9/11 Investigation (PENTTBOM)Federal Bureau of Investigation. September 2001. United States Department of Justice. Arkistoitu toukokuu 14, 2008. Viitattu May 22, 2008.