National Commission on Terrorist Attacks upon the United States. The 9/11 Commission Report: Final Report of the National Commission on Terrorist Attacks Upon the United States, book, July 22, 2004; (https://digital.library.unt.edu/ark:/67531/metadc123526/m1/1/: accessed December 11, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .