United States. Government Accountability Office. Sourcing Policy: Initial Agency Efforts to Balance the Government to Contractor Mix in the Multisector Workforce, text, May 20, 2010; (https://digital.library.unt.edu/ark:/67531/metadc290960/m1/1/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .