United States. Government Accountability Office. Taxpayer Privacy: A Guide for Screening and Assessing Proposals to Disclose Confidential Tax Information to Specific Parties for Specific Purposes, text, December 14, 2011; (https://digital.library.unt.edu/ark:/67531/metadc298867/m1/1/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .