United States. Government Accountability Office. 2012 Annual Report: Opportunities to Reduce Duplication, Overlap and Fragmentation, Achieve Savings, and Enhance Revenue, report, February 28, 2012; (https://digital.library.unt.edu/ark:/67531/metadc301551/m1/1/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .