Beffa-Negrini, P., Miller, B., and Cohen, N. (2002). Factors related to success and satisfaction in online learning. Academic Exchange Quarterly. September 2002.
Borowitz S., & Wyatt J. (1998) the origin, content, and workload of e-mail consultations. JAMA 280: 1321-4.
CNN.com. (2003). Firm can e-mail at work. September 19, 2003. CNN.Com Retrieved October 29, 2007 at http://www.cnn.com/2003/TECH/internet/09/19/e-mail.ban/index.html
Ferguson T. (1996). A guided tour of self-help cyberspace. [monograph on the Internet]. Rockville (MD): Office of Disease Prevention and Health Promotion, Office of Public Health and Science, Office of the Secretary, U.S. Department of Health and Human Services; 1996 Retrieved November 3, 2007 at http://odphp.osophs.dhhs.gov/confrnce/partnr96/summary.htm