1. U.S. Senate Committee on Health, Education, Labor & Pensions, Subcommittee on Primary Health and Aging. Chair Bernard Sanders, February 29, 2012. Dental Crisis in America: The Need to Expand Access. Available at: http://www.help.senate.gov/hearings/?id=a4b31ccd-5056-9502-5d8c-93b8b9da5d60; Accessed 17.12.13.
2. American Dental direct-access Hygienists' Association. Direct Access. Available at: http://www.adha.org/direct-access; Accessed 17.12.13.
3. History of the American Dental Hygienists' Association 1923-1982;Motley,1983
4. Connecticut Dental Hygienists Association. The History of Dental Hygiene. Available at: http://www.cdha-rdh.com/home/historyofdentalhygiene.htm; Accessed 17.12.13.
5. Contract practice: an alternative;J Am Dent Assoc,1983