REFERENCE
- Parsad , B. and Lewis , L. 2008 . Distance education at degree-granting postsecondary institutions: 2006–07 (NCES 2009044) , Washington, DC : National Center for Education Statistics, Institute of Education Sciences, US Department of Education . Retrieved March 20, 2009, from http://nces.ed.gov/pubsearch/pubsinfo.asp?pubid=2009044