A First Look at 21世纪美国成人识字率 (页面存档备份,存于互联网档案馆),美国教育部,2003. Accessed 2006-5-13. 2% of the population do not have minimal literacy and 14% have Below Basic prose literacy.
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web.archive.org
Human development indicators(PDF). United Nations Development Programme, Human Development Reports. [2006-11-07]. (原始内容(PDF)存档于2007-06-20).
Education互联网档案馆的存檔,存档日期2011-10-15.。2000年美国人口统计,URL accessed on June 17, 2005.
A First Look at 21世纪美国成人识字率 (页面存档备份,存于互联网档案馆),美国教育部,2003. Accessed 2006-5-13. 2% of the population do not have minimal literacy and 14% have Below Basic prose literacy.