United States. Government Accountability Office. Food Insecurity Persists in Sub-Saharan Africa despite Efforts to Halve Hunger by 2015, text, July 17, 2008; (https://digital.library.unt.edu/ark:/67531/metadc302808/m1/1/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .