United States. General Accounting Office. Year 2000 Computing Crisis: Status of Airports' Efforts to Deal with Date Change Problem, report, January 29, 1999; (https://digital.library.unt.edu/ark:/67531/metadc291266/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .