United States. Government Accountability Office. Counternarcotics Assistance: U.S. Agencies Have Allotted Billions in Andean Countries, but DOD Should Improve Its Reporting of Results, report, July 10, 2012; (https://digital.library.unt.edu/ark:/67531/metadc299259/m1/1/: accessed July 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .