United States. General Accounting Office. School Finance: Per-Pupil Spending Differences between Selected Inner City and Suburban Schools Varied by Metropolitan Area, report, December 9, 2002; (https://digital.library.unt.edu/ark:/67531/metadc293682/m1/1/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .