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Bower, Beverly L.; Hardy, Kimberly P. (Winter 2004). "1"(PDF). From Correspondence to Cyberspace: Changes and Challenges in Distance Education. Wiley Periodicals, Inc. pp. 5–12. Archived from the original(PDF) on 1 October 2011. Retrieved 9 July 2011.
Bower, Beverly L.; Hardy, Kimberly P. (Winter 2004). "1"(PDF). From Correspondence to Cyberspace: Changes and Challenges in Distance Education. Wiley Periodicals, Inc. pp. 5–12. Archived from the original(PDF) on 1 October 2011. Retrieved 9 July 2011.